Someone who makes or repairs locks.

Roget 690: doer, actor, agent, performer, perpetrator, operator; executor, executrix; practitioner, worker, stager.    bee, ant, working bee, termite, white ant; laboring oar, servant of all work, factotum.    workman, artisan; craftsman, handicraftsman; mechanic, operative; working man; laboring man; demiurgus, hewers of wood and drawers of water, laborer, navvy^†; hand, man, day laborer, journeyman, charwoman, hack; mere tool etc. 633; beast of burden, drudge, fag; lumper^†, roustabout.    maker, artificer, artist, wright, manufacturer, architect, builder, mason, bricklayer, smith, forger, Vulcan; carpenter; ganger, platelayer; blacksmith, locksmith, sailmaker, wheelwright.    machinist, mechanician, engineer.    sempstress^†, semstress^†, seamstress; needlewoman^†, workwoman; tailor, cordwainer^†.    minister etc. (instrument) 631; servant etc. 746; representative etc. (commissioner) 758, (deputy) 759.    coworker, party to, participator in, particeps criminis [Lat.], dramatis personae [Lat.]; personnel.    ... show more

Dutch: slotenmaker
Polish: ślusarz