Smart Lock Visible From Inside Only : Locksmith

Hi all, curious if a smart lock that is visible only from the inside exists. I am thinking some sort of smart lock that locks itself when you’re away. Possibly some sort of external indoor lock blocking the door to be swung open. Obviously there are pitfalls with such a item if run via wifi (e.g. no wifi no unlocking) but curious if something like this exists.Thanks.

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