If Chase doesn’t spend the night with me, this is often how he’ll wake me up in the morning. This is also how he lets me know he can’t find his food, and how he says he wants in at night (or any other time). We have no idea where he learned to “knock” on the door like this, but it’s a very effective method for getting what he wants.
He will also paw at the knob on the back door if he wants to go outside. We don’t let him outside by himself; we only ever take him out on his harness, and just on our property. Chase is a demanding cat; he rules the house, however much we might think otherwise.