Any person who, during those hours of the day or night when the premises owned or occupied by a state, county or municipal agency are regularly closed to the public, shall refuse or fail, without justifiable cause, to leave those premises upon being requested to do so by a law enforcement officer or guard, watchman or custodian responsible for the security or care of the premises, shall be deemed guilty of a misdemeanor and upon conviction, be fined not more than one hundred dollars or be imprisoned for not more than thirty days.