I've put together a proposal for Key:locked at https://wiki.openstreetmap.org/wiki/Proposed_features/Key:locked which I'm proposing to use on barriers like gates to describe physical access restriction via a lock.
Taginfo records 908 current uses https://taginfo.openstreetmap.org/keys/locked and it would be nice to document this tag as well work out if the current tagging practice makes sense or we need to make changes. Would very much appreciate any feedback and discussion about the tag.
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