Does karma force things to happen?

I know karma matures with the right conditions but does it ever force things to happen with the certainty that it will happen? Like for example can earning a specific karma say that it's going to force an effect, like when somebody does something good that means they'll become a private buddha in the future. Does it sort of "force" or push things in the direction of the karma to happen or is it still just waiting for the right conditions.