Place this clip at the reveal, just as the door opens in the scene, then follow it with a short reaction sound once the target looks caught. A buzzer before the knock can set up the surprise, while a scream after it can stretch the panic for a bigger payoff.
About this sound
This short clip pairs a hard knock on a door with a loud voice shouting FBI, open up, in a tone that sounds both official and over the top. The sudden knock and raised voice make it feel startling, tense and funny at once, like a raid arriving in the middle of an ordinary moment. It works best as a quick shock, landing before anyone has time to react.