Asked to work while off the clock

I work for a relatively new company who requires it's employees to do their own "marketing" or advertising. This is done thru handing out materials and flyers to area businesses and placing flyers on cars in parking lots etc.
I have checked my employment contract, and it doesn't mention anything about this, but we are required to do 12 hours per week with no mileage or gas reimbursement. It has been mentioned that if we cannot do this thru the week, we are to do it on our own time. Also, we are required to clock out for lunch, but we are not allowed to leave the office for this period of time. We are licensed and bonded, and the bonding company (supossedly) requires that there be someone in the office at all times.
Is this legal? I thought that if we were on company time doing company duties, we were to be paid for it.
Am I wrong?