A boom barrier lifts only when permission is given. Dream books read it as waiting for approval, or as a price that must be paid before you can pass.
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.