From the Super Mario Wiki, the Mario encyclopedia
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Super Mario series
Super Mario Bros. 2
Super Mario 64 / Super Mario 64 DS
Super Mario Advance 4: Super Mario Bros. 3
Super Mario Galaxy
Key Doors appear in the Ghostly Galaxy in Super Mario Galaxy, where they automatically open as soon as Mario or Luigi obtains a key. In the case of the "Matter Splatter Mansion" mission, multiple Key Doors can be unlocked at once with one key.
Super Mario Maker series
Key Doors were introduced in Super Mario Maker in the version 1.40 update, and available at the start in Super Mario Maker for Nintendo 3DS. They can be produced by shaking a P Warp Door (which in turn is created by shaking a Warp Door). They also appear in Super Mario Maker 2, with the same function as in the previous game. As of version 3.0.0 of Super Mario Maker 2, Cursed Keys can also be used to unlock Key Doors.
Super Mario Run
Key Doors appear in Super Mario Run in the level Boohind Lock and Key, where they can only be opened with keys. Once entered, Key Doors cannot be entered again. Key Doors resemble Ghost House doors from New Super Mario Bros. U, but with a keyhole in the center.
Captain Toad: Treasure Tracker
Key Doors appear again in Captain Toad: Treasure Tracker, behaving like in previous Mario games.
Super Mario Maker / Super Mario Maker for Nintendo 3DS
Super Mario Maker 2
Names in other languages