What is wrap foil around doorknobs when alone?

Wrap foil around doorknobs is a safety technique that some people use when they are alone and worried about potential intruders. It involves wrapping a layer of aluminum foil around the doorknob to create an electrical barrier that can disrupt the signal of a potential intruder's lock picking tool.

However, it is important to note that this technique has not been scientifically proven to be effective, and should not be relied on as a sole means of protection. It is also important to practice other safety measures, such as locking doors and windows and investing in a home security system, to ensure maximum protection.