On your way out" means "as you go out/leave the room, or the building". Most often this would mean that you should lock the door after you have gone out of the building and shut the door behind you. So "lock the door on your way out" really means "Lock the door immediately after you have left the room/building". Which means that it can definitely be considered as giving an order.
Either "By 2007, more Americans lived in or near cities than they did in rural areas." or "<span>Even today, the need for work is a common reason people move to urban areas."</span>
