This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One that makes or repairs locks.

n. one who studies or practices locksmithing

n. someone who only bets when they are sure they will win

n. A person whose occupation is to make, mend, or install locks, or to make keys for locks.

n. An artificer whose occupation is to make locks.

n. someone who makes or repairs locks

"Next I called the locksmith from the previous day, who again said he could be at my apartment in half an hour."

smith   

woodworker    joiner    shipwright    goldsmith    bricklayer    machinist    plumber    electrician    wheelwright    cabinetmaker