It’s a roller door. There is a bar that goes the width of the door and locates in the roller door runners.
I was surprised by how well it held up. The bars on either side protrude quite a bit into the roller door frame. Although it was bent a bit, there is little chance of getting enough leverage to pry the door open,
Thinking about modifying the bar though, it is just aluminium section that got badly bent up. If I can replace the aluminium bar with a steel section bar, then it is even more unlikely to pry the door open this way.
Also, thinking of putting a strip of metal bar to prevent anyone getting any leverage in the side of the door in the first place.