Is it illegal for an employer to do the following? (see below)?

Employee fifo on minesite. They didn't get around to booking his flight home, stuck another night. Employee advised his boss that he wanted and needed to go home. He was asked to work one more night. Employee refused. (Hasn't even been properly inducted anyway). Boss accepted. Employee drank alcohol for most of day. Was called later by site boss advised if he didn't go that night to work, they would not pay for his flight home or accomodation. Employee rang his direct boss again who advised to just do the job. Employee advised had been drinking. Employer not concerned. This employee feels he has been threatened and is being held against his will, needs to get home to his family. What are his are his rights in this situation?