Looking like subject is leaning on a wall

I know using a green screen you should keep your subject at least 5 feet away from the screen. So my question is how do you make your subject look as though they are leaning against a wall? I could ask the subject to "act" like there is a wall there but I know there has to be a better way! Thank you for any help!!

That's a great question....I would put up something small for them to lean up against and then use a mask later down in editing to hide that along with the green screen. Add a drop shadow effect for more style too.