a. Members of city, state or federal departments, who are assigned to locksmith work wholly within their respective departments or divisions, shall be exempt from the operation of this subchapter.
b. No person shall be employed by a duly licensed locksmith as an apprentice or trainee unless such person shall have a trainee-license, the annual fee for which shall be ten dollars, and during the time in which such person is so employed he or she shall be under the direct supervision of said licensed locksmith and such person may perform the duties of a locksmith. Such apprentice or training period shall not exceed thirty-six months. Each such licensed locksmith employer shall be responsible for notifying the department as to the termination or other change in the employment of any such apprentice or trainee.