The simplest lock to open though is the kind with the push button as the locking mechanism.
How to unlock a door lock with a knife.
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The levers on many knives feature.
Bend the closed end of one of the bobby pins to form a 90 degree angle.
Just insert the screwdriver into the small hole and press the button on the inside of the handle with it to unlock the door.
To unlock a door with a keyhole you can pick the lock with 2 bobby pins.
To unlock this kind of a door you should be able to take a butter knife or putty knife and manipulate the latch enough to retract it and open the door.
Most feature a small lever that you must press or move to allow the blade to close although this lever may be in a number of different locations.