Lock symbolizes secrecy, privacy, strictness, restriction and security.
This may be a manifestation of protecting privacy, secrets or protecting one's heart. This dream may also imply that the dreamer does not want to express an inner thought or emotion without letting others know first.
This dream may also be triggered by daytime experiences, such as: the lock is missing.
Yellow symbolizes the sun. It is a bright color, symbolizing full of energy and heat energy. Dreaming of yellow generally implies that even if you are in a bad mood, you will digest yourself. Just like the sun comes out, it is getting brighter and brighter, and your ability to control your emotions is getting better and better. This is a manifestation of positive energy growth. Good luck!