Are you on a salary or a wage? If you are on a salary, often your contract will have some clause about "reasonable overtime" and maybe even outside of hours training.
I think it's one of those contracts that's based on award. I know I don't get any overtime so they're already getting an extra hour and a half FREE work out of me each and every day cause they refuse to change my hours of work to suit my husband's hours (he was hired when I tried quitting previously in an effort to force me to stay cause they didn't want to lose me).