you hear a knock at the door. You peek through the window: it’s the cops, and they’re asking you to let them in. You have a right to say no or not say anything if the police ask to come inside of your home or ask to search your home without a search warrant. You are under no obligation to speak to the police or open the door. It is not a crime to keep the door closed.
If I don't have to answer the door if it's the police, I sure as shinola don't have to do it for some AOC-in-training. As Christopher Walken advises us...

Absolutely. In fact if you call the local authorities to have them removed, the local authorities are not going to be happy at all that King Biden is trying to presume authorities that even they themselves do not have. They will be glad to remove them for you and read them the law.
I’m also aware of those who did let the officer in, and were promptly taken to jail.
I do believe “exigent circumstances” must be demonstrated by the police for them to enter without a warrant.
A drunk driver who made it home safely wouldn’t apply.