Suppose I'm maneuvering around a 3D virtual world, viewed with a 3D headset. Suppose I come up to an old wooden door with a doorknob. What's the most natural, i

Suppose I'm maneuvering around a 3D virtual world, viewed with a 3D headset. Suppose I come up to an old wooden door with a doorknob. What's the most natural, intuitive way for me to open that door? Reaching down, turning the doorknob, and pulling sounds fairly intuitive. Forget about UI and context menus and all that other crap. A toddler could figure it out.