You shouldn't use emergency exit doors unless there's an emergency.
William just finished his shopping at the mall and is at the very back of the building, far from the main exit.
William wants to exit the shopping mall.
William walks back through the entire length of the shopping mall and exits through the front doors.
William decides to take a shortcut and leaves through the emergency exit at the back of the building.
William finishes his shopping trip successfully and without incident.
William is reprimanded by a security guard  who was standing outside in the parking lot and saw him use the exit.