Pop-A-Lock, America’s largest locksmith, car door unlocking, and roadside assistance company. Pop-A-Lock was started by law enforcement officers in 1991, Pop-A-Lock is now the largest full-service locksmith and door unlocking service in the United States. With 200+ locations, 38 states and 4500 cities, Pop-A-Lock employees have rescued over 100,000 children so far through the company's Emergency Door Unlocking (EDU) program as a free service to communities.