Phasmophobia Yurei sanity drain ability!
Yurei has the ability to zap 15% sanity if nearby. If it uses its ability, it will also fully close a door in its room as a sign to check your sanity. When smudged, Yurei will be trapped in its room for a period of time.
FACT: Yurei is not the only ghost that can close the door in the same fashion. All ghosts can do this, but Yurei does it more often as it also accompanies its sanity drain ability.