Place it at the start of a chat-prank edit, just before the reply appears, then follow it with the WhatsApp Message Sound for the moment the phone is finally answered, and use the Abriu o Áudio sound after that to show the message being opened.
关于此声音
This is a short door-knocking sound effect, lasting about five seconds, built around repeated knocks on a wooden door that sound close and insistent. It feels playful and slightly mischievous, like someone is waiting outside and will not stop until the door opens, which makes it an easy cue for a joke about an unexpected visitor.