Having a character go through a door that leads to a new environment

Pretty much explained in the title. I want to have one of my characters go through a door, say perhaps entering into a house, but walk into an entirely different scene. Imagine if you walked up to a house, walked through the door and entered into a green field outdoors, that kind of thing.

Any thoughts on how I might accomplish such a thing?

 

Put a trigger in the doorway, attached to a script that calls SceneManager.LoadScene.

 

I think you are searching for something like this

If it doesn't adapt to your needs, I would suggest you to search "unity portals" in youtube

 

A portal is much more complicated than what it sounds to me like the OP was asking for. Most games simply have a dark/opaque/closed door, and when you activate it, they fade to black, load the next scene, and fade back in.