About Us At our locksmith company in Mercer, Pennsylvania, we're committed to delivering unmatched service for your residential, commercial, and automotive lock and key needs. From lock installations to rekeying services, Don's Locksmithing does it all, and we look forward to serving you. Our owner, Don Knauff, is a proud graduate of Penn Foster College. Today, he's a certified locksmith with a trusted team offering service when you need it most.