This can be done in multiple ways.
How to unlock a locked door.
You may need to turn the screwdriver in order for the door to unlock.
This lock type is typically engaged by pushing the door knob in towards the door and turning it slightly in one direction.
Another way to unlock a door without a key is to simply work on making the door and its accompanying door lock somewhat irrelevant.
Just insert the screwdriver into the small hole and press the button on the inside of the handle with it to unlock the door.
Hook the hanger around the latch and pull it towards the rear of the car.
Inside is a small button that needs to be pushed to unlock the door.
Push in and turn in the other direction.
You may also need to tilt the knife a little till you find the suitable angle for moving the lock.
One of the most common ways to accomplish this is to kick the door down or ram it so that the lock is dislodged from the door jamb.
To unlock a door with a keyhole you can pick the lock with 2 bobby pins.
Insert the knife between the space in the door and the frame where the lock is situated since knives are thin it should easily slide in between the lock and the frame.
If your door has a push button electric unlocking mechanism you can also slide the straight end of the hanger down from the top of the window instead and use it like a finger to poke the button inside.
This should unlock any manually locked car door.
For an interior door that has a small hole in the handle you can use a small screwdriver to unlock it.
Apply pressure on the lock using knife and push it back in the door.
Bend the closed end of one of the bobby pins to form a 90 degree angle.