From Longman Dictionary of Contemporary Englishlocksmithlock‧smith /ˈlɒkˌsmɪθ $ ˈlɑːk-/ noun [countable] BOSHUT/CLOSEsomeone who makes and repairs locks
Examples from the Corpus
locksmith• I made a business card today for a locksmith.• He will be here with a locksmith.• Any locksmith can do it for you.• Also patron of armorers, blacksmiths, goldsmiths, locksmiths, and musicians.• Most importantly the hotel gains a security system whose cards can not be copied at the local locksmith.• Master locksmiths can make duplicates of most keys - including those for cars, safes, padlocks, etc.• The door was very strong, with an excellent lock, but the locksmith knew his job. 