Who should I call if the fire door of the middle door of the stairs can't be closed?

If the fire door of the resident in the middle of the stairs can't be closed, look for a property. The fire door is closed, be careful not to lock it. Smoke-proof stairwells are used in high-rise buildings. There are two doors in this stairwell, both of which are Class B fire doors. The normally closed reason is that there is a fire on a certain floor, and the smoke will not spread to the stairwell through this door. In this case, the stairwell is smoke-free and safe, and people can escape from the stairwell.