The little hole on the side of your door knob serves primarily as an emergency release mechanism. It allows the door knob to be removed and get the door unlocked in situations such as emergencies, accidental lock-ins, or you would like to replace a new door lock. By inserting a thin object like a paperclip or a pin into the hole, you can manipulate the latch or lock mechanism inside the door, enabling the door to be opened without a key. This feature is commonly found on bedroom doors and serves as a crucial safety measure to prevent individuals from being trapped inside a room. Therefore, if you encounter a locked door with a small hole on the side of the door knob, remember that it provides a means of entry in case of emergencies.
