Keys to the House is a uncommon Artifact card from Duskmourn: House of Horror (DSK), collector number 251. Current market price: $0.18 (foil $0.25), TCGplayer market prices via Scryfall.
{1}, {T}, Sacrifice this artifact: Search your library for a basic land card, reveal it, put it into your hand, then shuffle. {3}, {T}, Sacrifice this artifact: Lock or unlock a door of target Room you control. Activate only as a sorcery.