Loiding

Loiding is a bypass technique that uses a flat object, such as a credit card, to retract spring-biased latches. The flat object, referred to as a shim or loid, is slid between the latch and strike plate and used to retract the latch. Modern spring-latch doors use a deadlatch or dead locking plunger to prevent loiding.

Loiding is generally a surreptitious attack but certain tools and techniques may leave behind forensic evidence.