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Step 1: Improperly hung doors
There are a number of ways that a door can be improperly hung that make it easy to get through. If a door does have not a deadlatch or if it isn't functioning properly, then the door latch can be pried open. It is even easier if there is a large gap between the door and the strike plate. Here is a quick video tutorial.
If you can't pry the latch open from the front side, you can also use a paper clip to pull the latch open from the back. To do this, start by bending your paper clip into a large hook. Then insert it into the gap in the door and feed it behind the latch. Keep feeding it through until the end of the paper clip comes back out the front where you can reach it. Grab both ends of the paper clip and pull. The door should pop open.
Step 2: Open Doors with Privacy Locks
Fortunately, they are designed to be easy to open. The outer knob has a hole in the center that lets you insert small rod (in our case a paper clip). This pushes on a pressure plate that disengages the latch. You can then turn the outer knob and open the door.
Step 3: Simple Latch
Your paper clip can also be used to re-latch the door. To do this, slide the latch down so that the door can barely close. Then with the door closed, use your paper clip to slide the latch down the rest of the way back into the fully latched position. This trick makes it looks like it was never opened.
Step 4: Cheap Luggage Locks
Step 5: Open Paper Towel/Toilet Paper Dispensers
Most often you can open a dispenser by inserting the straightened tip of a paper clip into the key slot and pressing down on the plate below. When there are two plates, you need to straighten out the whole paper clip and bend it into a U shape. Then use one end to depress each of the plates at the same time.
Step 6: Toy Handcuffs (and Other Toy Locks)
Note: A paper clip can not be used to unlock actual police handcuffs. While the construction is similar, a large paper clip is too wide to fit in the key hole and a small paper clip isn't strong enough to raise the pressure plate. So you will need to use a bobby pin to unlock those.