1. It shall be unlawful for any person, firm, association or corporation, employing in the same building or on the same premises five or more males and three or more females, to fail to provide separate lavatories or toilet rooms for each sex and to fail to designate the same plainly by a printed or painted sign on the door of the lavatory or toilet room so provided.
2. Any person, firm, association or corporation violating the provisions of this section shall be guilty of a misdemeanor.
3. In conjunction with peace officers, the Labor Commissioner shall investigate and report to the proper officer any violation of this section.
4. This section shall not apply to:
(a) Persons, firms, associations or corporations located in office buildings where there are lavatories or toilet rooms for each sex reasonably accessible within the building.
(b) Persons employing servants or other domestics in their homes or residences.