I think what you are missing is that barn doors are not really "attached" on the bottom/sides and there is a gap between the door and the opening. You'd have to consider what kind of guide system you are using on the bottom and whether that will stay on track (literally!) with someone leaning on it.

Ditto- the door is not leaning on the wall. It’s running along the hardware in front of the opening.

How about you buy a chair? Don't lean on any wall that isn't a solid wall.. Or come downstairs to lean on a wall..........or join a gym. : )

There should be no track on the floor for a barn door so no you can’t lean against it so I agree get a chair or sit on the bed

Your could have a T guide mounted to the floor. A kerf is cut in the bottom of the door and the guide is installed at the edge of the opening so the door always covers it. They are standard for barn doors to keep them from banging into trim. The door will flex but it won’t swing open