A door is a hinged or otherwise movable barrier that allows ingress into and egress from an enclosure. The opening in the wall is a doorway or portal. A door's essential and primary purpose is to provide security by controlling access to the doorway (portal).
It is recommended to always face Qibla while sitting, eating, resting, reading, etc except when you are in the toilet then it becomes Haraam to face Qibla.
If you have the option, it is good to make the entrance door facing Qibla as well.