(for KL Siew's Use Only)
First, boss's instructions should be followed. Secondly, when it comes to payment for the extra hours of work, that is a different matter. What you people should do is to keep proper records of the extra hours of work. Things like time cards should be properly kept as these may be useful as evidence one day. At the end of the month, you will put in claims for overtime or whatever. If you boss does not want to pay then the fault is on him and it will easier for you to complain to the authority.