You will probably need a service call. In most cases, the locksmith will be able to pick the lock without causing any damage. Before you call, be sure that you can tell the locksmith the street address where you are. Also, they will need to know if your keys are lost altogether, or simply locked inside. Expect the technician to scrutinize your credentials to ensure that you are entitled to enter the door in question. Most locksmiths offer emergency service for situations like this, but expect to pay a premium for after-hours service.