One con is that maybe you like it for a certain period of time and then get sick of it. Also, you have to constantly know that you can't have any say or give any ideas.
According to "The Giver" you receive a job when you are twelve years old. This is not good in my opinion because when you are twelve you are still very young and like to hang out with your friends. You are responsible for small jobs, like chores but in reality you still shouldn't have a job. You won't have any fun time.