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.
You may need to turn the screwdriver in order for the door to unlock.
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To unlock a door with a keyhole you can pick the lock with 2 bobby pins.
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.
The levers on many knives feature.
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 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.