It seems that if an object gets stuck under a fire door, the door will not lower or raise or respond to the button that triggers those actions.
When I found this glitch, I had used a grenade to disable the turrets, which moved one of the turrets under the door and triggered the door to close. It got stuck at a height lower than crouch which made this area impossible to pass through. Also touching the door in this state was an instant death.
map : bm_c1a3a at: -35 x, -1258 y, -255 z
setpos -35.646336 -1258.062988 -255.982117;setang 26.277779 11.186058 0.000000
