A can opener gets into something sealed, so tradition reads it as access — the key to a closed situation or a person who keeps to themselves. Not finding one points to frustration.
Has this come up in your dreams before? What was going on in your life then?
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.