All doors provided for the doorways of every such room or building shall open outwards, and every person using or occupying any such room or building as a theater, opera house, concert hall, music hall, public school, church, or for other like public assemblage during the whole of every exhibition, performance, or assemblage therein shall cause all the doors thereof to be left unfastened or latched or barred upon the inner side only so that any person may readily and speedily open the same from the inner side of such room or building and shall cause all the stairways and other ways and passages leading to every such door to be kept open and free from persons seated or standing therein or other obstructions. Any person failing to observe this section is guilty of a misdemeanor and, upon conviction thereof, shall be punished by a fine of not more than two hundred dollars.