Automatic Locking

On my iPad and iPhone there's no problem with the auto locking, but on my Mac, 1password doesn't seem to automatically lock even when I've set the preferences to lock after 1 minute. How do I ensure it locks within a minute and stay locked till I unlock it? I had no activity on the Mac except a video playing. Does the video count as activity? I would like it to lock automatically (as you can tell).
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