Wrapping your door handle in aluminum foil can act as a simple warning and deterrent. If the foil is damaged when you return, it may mean someone tried to open the door. It also makes noise if the handle is touched, alerting you and possibly scaring intruders.
Burglars prefer easy, quiet targets, so visible foil may discourage them. For extra security, hang a light object inside so it falls and makes noise if the door moves.
Use this trick alongside proper locks, lighting, or security systems—it’s a small, low-cost way to boost awareness and safety.