What is wrap foil on door knobs when alone?

Wrap foil on door knobs when alone is a common safety hack. It is done to prevent any unwanted or unauthorized access to a room or apartment, especially when you are alone. By wrapping the foil on the door knobs, the conductivity of electric charges is cut off, which makes it impossible to open the door by using an electric circuit. This can potentially protect you from intruders who try to use specific electronic devices to unlock the door. However, it is important to note that this is not a foolproof protection method and other security measures should be taken as well.