Any officer or employe or agent of such municipality who shall require any employe or other person in any such fire department, save as hereinbefore excepted in section 2 of this act, to be on duty in such employment for a longer time than that hereinbefore provided, or to be off duty for a lesser time than that hereinbefore provided, shall be guilty of a misdemeanor and on conviction thereof shall be punished by a fine of not more than 100 dollars or by imprisonment in the county jail for not more than 3 months, or by both such fine and imprisonment.