In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Door
If you see a closed door then you will have some distress which will, however, soon pass. If you see the door to your house is open then expect joy in your personal life. If you see a large old door, such as the door to a castle or old mansion, then you will have good news.