Audio jack normally closed switch
https://www.digikey.ca/en/products/filter/audio-connectors/434?s=N4IgjCBcoKwCwWiAxlAZgQwDYGcCmANCAPZQDaIcADAMxUDsATCALpEAOALlCAMqcAnAJYA7AOYgAvtKA
Put a lanyard or something on the end of the male connector