You simply need a straight stiff tool to unlock it try a straightened paperclip or a small screwdriver.
How to unlock us apartment door with push lock.
The pressure exerted on the bump key causes the key pins to push the driver pins above the shear line.
At this exact moment if the right amount of torque is applied you will be able to unlock a door without a key.
If you need to break into a bar latch you can use a thick envelope to push at the metal loop until the door gets unlocked.
To unlock this door from the inside the procedure is reversed.
Click on image below to enlarge.
Push in and turn in the other direction.
Hold the battery up against these.
For a demonstration of this technique you can watch this video here.
You may also need to tilt the knife a little till you find the suitable angle for moving the lock.
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.
Older doors may still come equipped with a third type of privacy lock.
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Inside is a small button that needs to be pushed to unlock the door.
This will give the automated door lock enough juice for you to type in your code and get in.
The automated door has two small prongs on the exterior.
Once you are in your apartment you can open the lock from the inside and replace the old batteries with new double aas or whatever your door takes.
Some people swear by.