> Permission in such a scenario is implied.

I say this in good faith, and out of concern for your well being, you should look at the laws in your state and reconsider your stance on open doors.

At least where I live, if you are in my house and I don’t think you belong, I can use deadly force. Very few terms and conditions apply. Doesn’t matter if the door was unlocked, open, labeled as open, or you thought you had an invitation to enter.

Please don’t let yourself into other peoples houses, regardless of whether you think you were invited or not.