Fully logout user firebase/google

When I logout in my app, using Firebase Authentication, and I go to log back in, it automatically logs me in. I don't want it to do that. I would like to see the normal list of accounts to pick from to log into. When I did this in straight Flutter I remember needing to log out of Google and Firebase Authentication:

Future googleSignOut() async {
  await GoogleSignIn().signOut();
  await FirebaseAuth.instance.signOut();
}

Unfortunately, I get an error and it has to do with GoogleSignIn(). Anyone have this issue or know how to do a full logout to where it asks to pick an account to log into?