The Apprentice told Ingrid that the Sorcerer doesn’t make deals with people who go over to the dark side, but then he made one with Ingrid because “people can surprise you.”
So yeah, there’s no reason why the Sorcerer couldn’t have made a deal with Rumple for that oh so handy door.
It’s another overly convenient magical transportation device.
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"He was a lot of things to me" "The only conclusion was love"