Hallo. "For example, a lock that unlocks at the wrong time has failed, but it may be considered fail-safe if its failure does not send the door flying open or attract undue attention to the door's unlocked state. In contrast, a fail-secure lock will remain locked during a failure, but cannot be unlocked even by the correct key." It's from here. I don’t understand the underlined part. What does “has failed” refers to? The phrase seems to be so structured that unlocking of the lock at the wrong time is its normal operating condition and “has failed” refers to the fact that the lock has failed to unlock at the wrong time. But that makes no sense. What do you think?