Fire exits need an exit device, typical known as a push bar, also known as a panic bar. Even then many doors will need a push bar because of its ease of use. You see them all the time in most stores. Select exit devices come with the ability to remain in an unlocked state. Allowing the door to remain open during business hours for customers to enter freely. This is a common thing seen on a store front door but not as common on back doors. These were not chosen for just looks, they are a necessity for fire code in most places. This is even more true with a door closer in place.