Ignore the knock on the door
While ignoring the knock, you may simply decide to continue going about your normal activities inside – NOT pretending that you’re not home – not being particularly quiet. Reason being that IF the stranger is a burglar – that person may go ahead and break-in if they think no-one is home. By making some noise or turning on a light, the stranger will know someone is home. On the other hand the person may continue to knock hoping to get your attention.