I just read your 2nd comment. My Emma was always hungry and pecking at feeder and ground until I realized that she wanted to eat but food wasn't going into her mouth. Once I started giving her wet food, she started eating and grew bigger.
Before I realized that she had a hooked-beak problem, she had a condition called "pasty butt". I heard giving them yogurt may help their intestinal health, so I was feeding her yogurt every morning/evening. I crushed freeze-dried mealworm into yogurt and spoon fed her every morning/evening. This went on about 3 weeks before the pasty butt wasn't an issue. After she moved to outdoor, I gave her wet crumbles every morning for about 2 months as well until I realized that she didn't have hooked beak any more and she became more outgoing.
I don't know anything about force feeding chicks if they are not motivated to eat. Emma at least showed her appetite. I hope your baby start eating soon.