No billiard table, pool table or bagatelle table shall be maintained behind any closed, locked or barred door at any place of business in the city. The main entrance of any premises for which any permit has been issued shall at all times remain unlocked and unbarred while any games are being played upon the premises; and at all such times all premises where any games are being played shall be kept in such condition as to be accessible for inspection to all police officers. (Ord. No. 1002 (NCS), § 5; Ord. No. 1507 (NCS), § 1(G), (H).)