Put it early in a scene, before a knock answers it, then follow with a low dramatic sting once the door finally opens. In a prank edit, place it just before the reveal so it sets up the payoff.
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This 3.7-second clip is the dry, raspy scrape of nails or claws dragging across a door, repeated just long enough to feel deliberate. It gives a tense, uneasy feeling, like something is trying to get in from the other side and will not stop. The sound works because it is so plain and close, putting the listener right beside the door.