What is wrap tin foil around door knob?

Wrapping tin foil around a door knob can be an effective method for preventing unwanted people from entering a room or house. The shiny material reflects light, making it difficult to see if the door is locked or not. It also creates a slippery surface, making it harder to grip and twist the knob. Additionally, the foil can act as a noise deterrent, as it crinkles loudly when someone tries to turn the knob. However, it is important to note that this method is not a substitute for proper locks and security measures, and should only be used as a temporary solution.