Everything with a chinchilla is about Trust. I would just start by getting him to hop in your hands while he is in his cage. During treat time, keep the treat in your hands and stay very still. He will come for the treat and when he takes it, don't move! Just let him see that you are not trying to bait him and catch him like prey. A chinchilla is a prey animal so instinctively will try to get away from whatever he views as a threat or something that might eat him (even though you aren't! They don't know that right away!) Continue to do this with him everyday. Eventually he will begin to hop in your hand on his own and when he does, you know your bonding with him has taken a step forward. As long as you continue to build his trust in you, he will respond to you much more willingly.
I have one that all I have to do is cup my hands on the floor and he comes running and hops in my hands because he knows playtime is over and will possibly get a treat for going back in his cage with no issues.