What are some films with scenes involving locks?

Can you think of films with scenes in which a lock (or locker, safe, handcuffs, etc.) is prominent and integral to the plot? I am helping compile a montage of scenes involving locks (like Dial M for Murder key hiding, or Gaslight desk lock opening). Heist films, people getting out of handcuffs, locks being picked -- these things would all be helpful.
posted by emflr on Jul 9, 2009 - 43 answers