National Lock & Key is a licensed, insured, full-service commercial, automotive, and residential locksmith serving Northern Virginia, Maryland, and Washington D.C. Our industry experience and expertise help us to provide efficient and long-lasting solutions to all lock and key-related needs, including friendly and cost-efficient car key duplication, key replacement, lockout services, car key programming, file boxes, mailboxes, safe lockouts, and keyless entry. Upfront estimates. No hidden fees.