St.Charles Locksmith provides 24 hour lock & key services all over Waldorf, MD. Our skilled technicians will solve any residential, commercial or auto locksmith issue. With a response time of 20 minutes on average, you know where to call in case of an emergency. We offer security systems installation & upgrades, lock changing and repairing, emergency lockouts and much more. We guarantee your satisfaction 100%. Call for your free price estimate.