This is a bit more complicated.
It is not okay to categorize a lock as a tourist attraction. A lock is a lock. If you don’t see the precise category then this is how Google Maps tells you not to add such places.
Further, locks are a geographical feature. They can only be added by Google.
Learn more here
https://www.localguidesconnect.com/t/understanding-things-we-can-not-edit-on-google-maps/378405