Thor is learning that "all good things come to those who wait."
When we go outside and again when we come in, I have been having Thor sit while I put on/take off my boots. That's pretty routine now. So I've upped my criteria. He now has to stay sitting while I open the door, waiting for my release. I started by simply putting my hand on the doorknob. If he remained sitting, he got a treat and we went outside. If he got up, we simply tried again. Next step was to open the door while he remained sitting. Just a crack at first. Again, stay sitting, get a treat. Get up, the door closes and we start over. When we progressed to the door opening fully, I slipped my fingers through his collar to ensure success. This morning, he stayed sitting with door fully open and no fingers! His reward for staying put is sometimes a food treat and always a release to go outside. A bonus to this game is that Thor is beginning to understand a verbal release ("okay").