What is foil on door knobs when alone?

The use of foil on door knobs is a common safety technique that people use when they are alone at home. The idea behind this technique is to prevent unwanted intrusions by using a simple piece of aluminum foil. The procedure is easy to do and involves wrapping the knob with a sheet of aluminum foil and folding the edges around the knob. This method creates an electrical field that makes it difficult for someone to twist the knob from the outside, thereby providing a level of protection for the occupant. It is important to note that while this technique can be helpful in deterring simple break-ins, it is not a foolproof method of keeping intruders out. It is always recommended to lock the door and use additional security measures to ensure your safety.