You would be surprised at how many of the locks and latches around us can be bypassed with a simple paperclip. Some are cheaply constructed. Others are simply poorly installed. I am going to show you several examples. This illustrates how most locks are primarily just a deterrent and aren't 100% secure.
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Step 1: Improperly hung doors
You may have heard of people opening a door with a credit card. Well, you can usually do the same thing with a paper clip.
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.