It shall be unlawful for any person to keep open or admit persons to any public dancing hall owned or operated by him or to allow any person to continue thereat between the hours of twelve o’clock, midnight, Saturday and twelve o’clock, midnight, Sunday, and all such places shall be and remain closed to the public between such hours. The violation of the provisions of this section shall subject the offender to a fine of not less than ten nor more than fifty dollars for the first offense and for the second offense not less than fifty dollars nor more than one hundred dollars or imprisonment for thirty days.