Very few if any closets open inward -- which means the hinges will have their pins on the accessible side. Just drive the pins out of the hinges, and the entire door can be pulled out of the frame (and easily put back once the lock is either opened, replaced, or the key found and duplicated).
If the pins are peened in place, a tool like a Dremel could be ...
I've seen some people close little slips of paper in the doorframe (hinge and/or handle sides) that would fall when the door is opened, and/or stack boxes against the outside of the door in what appears to be somewhat random fashion but where the edges and corners line up with pen or other markings in a particular way, and compare before vs. after pictures. ...
I have added notches to the side of the key head in the past. One of the advantages to using this method is that you can find the correct key in the dark.
Start with this:
Take a file to the edge of the key head. Move it back and forth to create a furrow. End up with this:
Add as many notches to the key as you require. If your key has a flat edge that ...
Since I have lots of different color permanent markers, but not lots of different colors of nail polish, I use my wife's clear nail polish.
Mark the key up with the sharpie - I usually put a dot on - and then a drop of clear nail polish to cover it and keep it on there. Once dry, it stays on there forever - or until you use nail polish remover to remove ...
In Dr. No James Bond placed a hair across his door closures which would fall off as soon as somebody opened it.
Of course you have to test if the hair will stay stuck for the time you are on leave. Consider using some glue.
Anaximander's answer to a question on travel.SE explains the biro technique:
If your suitcase closes with a zip, then it can be opened with a normal biro (the ubiquitous cheap Bic office biro works particularly well). Simply hold the biro so it points parallel to the zip, with the nib end pointing into the zip teeth (I find about 60 degrees works). Then ...
I've often seen people solving this problem by using colored key caps.
But if you are like me and want to avoid extra weight/volume, you can use dot stickers. Stick one on each side for faster lookup. (update: according to another user, such stickers often have the color rub off in your pockets)
Vintage locks employed two concepts, sometimes individually and sometimes together.
A warded lock has structures within the lock, called warding, which are designed to fit in notches carved into the key. A quality warded lock will be constructed so that the only way for a key to reach the mechanism is for it to snake around some complicated warding, but ...
I should suggest trying a bobbypin or a smaller flathead screwdriver if you'd like to save it. From my experience, these types of locks are very easily opened, even with almost no skill in lockpicking. After all, you might find the key again.
Another option could be to drill out the center of the lock, therein making it very easy to open the door. This ...
Coloring the keys is a good way to go.
For coloring I would suggest nail polish, which is quite durable. Other spray paint might be tried as well, but nail polish is really accessible and easy to apply.
If you want you could even mark keys with letters or numbers or symbols. But please take care not inviting thieves by writing house number or address on ...
You only really have three options here, and the choice boils down to how much you value your time and money.
Method 1: The Easy Way Out
Travel as far as necessary to find a real locksmith, and pay them to take care of it.
(Alternatively, mail the entire computer to the locksmith, and hope it gets there and back in one piece.)
Bonus: the locksmith can ...
How to Open a Door Chain Lock or Bar Latch from the Outside
Image taken from the above site.
The one I believe in mostly is taking a piece of string and tying it to the chain, then threading it over to the outside of the door and pulling chain open. But I can vouch that all of these methods work.
For the rubber band method you can use a string that is ...
Grab the lock with your left hand (so that opening lever points to the right.) in a way that your finger tips bring tension on the lock. You will need a high amount of tactile impressions on your fingers.
Now with your right hand rightmost finger (the small one) push that opening lever to the right, again to bring tension on the mechanism.
Then carefully ...
At its simplest, a door hook on the inside of your door will do the job for about $2. at a hardware store. You twist the hook into one side of the door and the loop on the door frame (or vise-versa). No tools needed.
… A simple request on the outside of your door.
You could try to group them together in small clusters based on your daily activity, and even put them in a sequence based on step by step usage. Add a label rather than a color on each key, especially if you have a lot. If the keys keep adding, an idea would be to switch "technology" (badge-based access systems etc.).
There is a couple tried and true methods used of varying difficult from living in AK and ND.
1) Install a storm door. This will provide other additional benefits as well. Should have no frozen up key lock issues after that. $80 to hundreds of dollars, much easy to install yourself than a framed door.
2) Go to a keyless lock. $60 to hundreds. Just keep in ...
The lock you show us has three number rings. This gives us 1000 possible combinations. So in the worst case you could simply try all of them:
Start with one of the outer number rings.
increase its numbers and test if you can open the case for each
if you completed a round increase the next ring by one number
[rinse and repeat]
Another method is this:
I use order and memory.
Start by removing any keys you don't need on your keyring. They're just adding to the bulk from the off.
I order my keys by frequency of use and by direction where one way represents locks at the front of my house and the other way represents locks at the back of my house. The car key is the "root", the key next to this is "forwards"...
As you're shutting the door, get it as closed as you can while still reaching your arm in, and set something on the floor (solo/dixie cup, nut, anything that will move easily when pushed by the door) right by the door.
When you come back and open the door, check to see if you're pushing it or if it's already been shoved from where you placed it.
Stick gum on several spots like light switch, door knob, drawer etc., whereever you think the intruder might touch.
Take a picture of the gum. When you return, if there is a finger print or if the gum is in different shape to that of your picture then someone has touched it. You know what that means, then, don't you?
With my approach, you not only can ...
The original image of the key is interesting to me. You could just wander into the local locksmith and ask if they have a set of keys that might fit. There's a limited number of variants on these keys and you may just be able to buy one off the shelf as the lock is only a token gesture towards security.
If you're not overly attached to the lock, there's the ...
As you mentioned, a small flat screwdriver works best. However, you can use basically anything that's thin, stiff, and non-round. I used to do this all the time to my brother to piss him off (ah, youth).
Some of the things I've used:
The metal clip from a cheap pen
A paperclip with the very tip bent to a 90 degree angle (to simulate a screwdriver)
A safety ...
I recommend cutting the cable next to the lock mechanism. This will allow use of the laptop and moving it. When time and circumstance permit, remove the lock mechanism. Taking it to a repair shop would be a good idea and not cost much.
Locks do not prevent theft, but make theft more difficult. Someone can't just pick it up and walk off.
As many people have seen Death note animation series so I am just taking about that scenario where he comes to know that someone has break his room and tried to come in. In chapter 16 of Death note manga there is situation when Ryuzaki comes to know that someone has tried to enter his room. But the fun part is how he did that .
It's great if you will read ...
Other suggested methods of removing the hinge pins or picking the locks are good.
You can also try to depress the latch via a thin wire if the door opens out or a thin plastic card if the door opens inward. What you goal would be is to depress the latch as if the door were closing on its own.
Without a key, the lock is useless (unless you want to pay for a locksmith to make another key), so I will assume damage to the lock will not be an issue. This is what I did, and I did it back to back on 3 locks (my staff likes to lose keys) so this was not a fluke.
Get a straight edge screwdriver with a small head (It needs to fit inside groove in lock). ...
It's a variation on the existing answers, but perhaps a worthwhile one.
Attach a short piece of string to the top of the door frame, towards the handle side (as opposed to the hinge side). It should be short enough that it's likely to go unnoticed, and it should ideally be the same color as the door.
When you close the door, place the string so it goes ...