Any animation state with nothing in it will play the rest pose. You need to have a “pose animation”, a one-frame animation which defines a pose, to exist in your state for it to do something.
If you don’t want to actually make one of these, what you can do is take your door opening animation, put it in the “DoorsOpen” node, right-click it, and hit “convert to single-frame animation”. A single-frame animation, rather than playing, takes in a float value which tells it where to be in the course of that animation’s timeline. You just have that float value be set to the final frame of the doors opening animation, and it will “play” that static pose of the doors being all the way open, until you exit the state.