No amusement arcade exhibitor shall permit, on days when school is in session, any person 16 years of age or younger to operate any mechanical or electrically operated amusement device or to be or remain in an amusement arcade before 3:00 p.m. This provision does not apply to juke boxes, mechanical musical instruments, or other mechanical amusement devices designed to be ridden, such as mechanical horses, automobiles, and carrousels. Violation of this provision shall be a minor misdemeanor.