N.Y.C. Admin. Code § 20-298: § 20-298 Definitions.

Whenever used in this subchapter, the term "locksmith" shall mean a person dealing in the mechanical actions, and the correct operations of all locks, key or keyless, or similar devices, and whose trade or occupation is repairing, servicing, installing, inspecting, opening and closing such locks by mechanical means, other than with the regular key made for the purpose, without altering, marring or destroying the original condition or effectiveness of such locks or similar devices in any shape or manner, or a maker or manufacturer of locks, pressure keys, skeleton keys, pass keys, jigs, or any other mechanical device to aid a locksmith in the plying of his or her trade.