When you take a salaried job you are getting paid to do a job the best that you can. If you're not capable to do it in your normal working time (you've probably been screwing off) then you are expected finish it on your own time. That's what you are getting paid for. If you want overtime, get a hourly job, join a union.
What has become of work ethic? Most of our young people think that the time that they are at work is their time not the time their employer has paid for. No wonder other countries are passing us by as we give our jobs away.