No person shall block, impede or obstruct any entrance, exit, or approach to any hall, church, school or other public place or to any place of business in such manner to unreasonably prevent, hinder, delay, obstruct or interfere with the free passage of any other person who is entering, occupying, or leaving any of the aforesaid places, or who is performing any service or labor or who is seeking or obtaining employment or who is purchasing, selling, using, delivering, transporting, or receiving any goods, wares, merchandise, services, entertainment, accommodation, or articles, or who is attempting or seeking to do any of the foregoing; provided, that nothing contained herein shall apply to lawful picketing.