Dreaming about a closed door is often symbolic of our feelings shutting out about something. This closed item symbolizes the mental and emotional turmoil of locking out something which reminds us of guilt. There are various theories on what dreams represent and why we experience them each night – when it appears that things are closing down, that is the time be extra careful in the waking hours.
A closed environment in a dream may be a sign of protection and safety from some bad experience you have before or could possibly experience in the future.