Locking them in the coop and run for a week is a good idea to 'home' them to the coop.
Clipping wings might not be a good idea if you free range, as it lessens their defense against predators.
Think about why they are not roosting in the coop:
Do you have enough coop and roost space for the number of chickens you have?
Pics of your coop and roost, or accurate dimensions in feet, would help folks help you figure a solution.
Is there plenty of ventilation in the coop?
What is your climate?
Putting your location in your profile will help folks make more viable suggestions.
Is there some kind of pest in there that makes them uncomfortable?
Rodents, mites, etc...have you had any predator issues?
How old and how many are these birds and how long have you had them?