I would save the forced socialization until after you have tried all other things. Take the cage onto a table and put out toys and blankets and hidey homes(igloos), then just sit at the table and let him come to you. Forced socializtion is great adn it works but I always think it is just to much of man handling for a rat to jump to first off. try opther things first. offering treats after you have put him back in the cage, making it a consistant time that you are taking him out and things like that.