If I chose to ignore my boss, I probably wouldn’t have a job come Monday. However, I wouldn’t land in jail because no crime had been committed.
If firing Comey resulted in stopping the investigation, then you would probably get more support from me. But as it’s been pointed out by legal scholars, the President has the power to do just that. It wouldn’t be a popular move, and he would get a lot of push-back, but it still wouldn’t rise to the level of a crime.