A secret door is read as an unexpected opportunity or a path you had not considered. Tradition sees it as a sign that the way forward exists, even if it is not where you were looking.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.