When thinking about barn doors and how they can be used inside the house the first thing that comes to mind is the bedroom.
Barn door inside or outside room.
My cleverer than i am brother who also happens to make sliding barn doors for people took one look at my door and suggested i put a sliding latch on it on the inside top of the door with the piece you slide your latch into on the top part of the door frame.
This works on the outside but you ll need to install a recessed pull on the inside so the door clears the door jamb when it slides open.
On this kind of door the exterior trim is wide enough that you will still see the frame around the door despite the overlap.
This is the perfect place for such a feature considering how much cozier and inviting the room feels like with it found on ksaarch.