Hold the battery up against these.
How to unlock us apartment door with push lock.
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Push in and turn in the other direction.
Older doors may still come equipped with a third type of privacy lock.
The automated door has two small prongs on the exterior.
You simply need a straight stiff tool to unlock it try a straightened paperclip or a small screwdriver.
Apply pressure on the lock using knife and push it back in the door.
To unlock this door from the inside the procedure is reversed.
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.
Click on image below to enlarge.
For a demonstration of this technique you can watch this video here.
This lock type is typically engaged by pushing the door knob in towards the door and turning it slightly in one direction.
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.
Inside is a small button that needs to be pushed to unlock the door.
You may also need to tilt the knife a little till you find the suitable angle for moving the lock.
At this exact moment if the right amount of torque is applied you will be able to unlock a door without a key.
The pressure exerted on the bump key causes the key pins to push the driver pins above the shear line.