Another problem is that some of the hotel room doors have a hydraulic closing mechanism and will automatically close if they are not physically restrained applying a force.
This is particular true for hotel rooms which use a swipe card for access to the hotel room. It appears that when the swipe card is inserted in the hotel room slot, the electromechanical access control system activates the hydraulic locking mechanism to allow the person to enter the room.
If the hydraulic locking mechanism was not used, the doors would not close automatically, however the door automation would not be possible.
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