The chief of the fire department, or other officer acting as such, may command any person present at a fire to aid in the extinguishment thereof and to assist in the protection of property thereat. If any person shall wilfully disobey any such lawful requirement or other lawful order of any such officer he shall be deemed guilty of a misdemeanor, and upon conviction thereof, shall be punished by imprisonment in the county jail for a period not exceeding 90 days, or by a fine not exceeding 100 dollars, or by both such fine and imprisonment, in the discretion of the court.