Jake knows how to side pass... He's not perfect at it yet, but he knows to do it when I tell him so we are getting there slowly but surely.
Something that I noticed that helps, 1) when you get him lined up to the wall (facing it), have someone else on one of his buddies stading beside him but a couple steps away and then ask him to do it. It helped jake because he wanted to sit next to his buddy.
When we go work cows, I have him always rest next to the fence, so now everytime we stop, he wants to step on over to it before I even ask
Something else too, Jake can try to be lazy on me if he doesn't want to do it, but if I have my spurs on to cue him with, its a much better response.
Not saying to jab the heck out of him with spurs of course, but just enough to get him to move off the pressure quicker.
Also, if you lean slightly the opposite way you want them to sidepass to, I think it helps.
All just how I do it with my horse, so just work with him til you find what works for you and your horse.