It shall be unlawful for any owner, proprietor or person in charge of any poolroom, billiard hall, pin alley, table or ball alley, or bowling alley, wherein beer is served, or wherein such premises are licensed to serve set-ups pursuant to state law, to permit or allow any minor under the age of twenty-one (21) years to enter, be or remain inside of any such poolroom, billiard hall, pin alley, table or ball alley, or bowling alley.