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You push in the right spot and a closet is revealed (or other hidden space); it just gives a cleaner look. The door will be 25”x80” and weigh about 20-25 lbs. It is not yet built so I don’t have any photos but I’ll add a photo that I found of a jib door under a staircase:
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would be an excellent product for your application.
Assuming your door will be 1-3/8" thick the Soss 216 hinge as seen here:
would be an excellent choice.
Another interesting concept would be the Rev-A-Shelf RRL201 Magnetic Cabinet Door Lock - Lock with Strike Plate - 1 Each as seen here:
And you would also need the Rev-A-Shelf RSRL202 Magnetic Cabinet Door Lock - Magnetic Key - 1 Each as seen here:
Which would permit you to conceal thoroughly the way by which it is secured although without it having a touch latch type of operation you might need a finger hold to pull the door open.