Dream recall is basically a practice to help remember when one is dreaming, and to remember one's dreams after waking. It is used by some as a method to lead to lucid dreaming (basically becoming conscious within a dream, and therefore being able to influence or even right-out control some aspects within the dream), and explore some other practices according to spiritual beliefs.
As far as opening a door, it is possible that being able to lucid dream, if that's what you mean by dream recall, can enable someone to open a door within a dream. But what is behind that door depends on many factors. It may be another room, elements of which are recalled from memory, it could be some abstract space (again, created from bits of memories and tropes of memories), or it could be a void (if the hypocampus does not recall an actual door and create or recall a room for the other side -- at least in time for your opening of the door).