Virginia laws regarding a company forcing employees to do work off the clock and is possibly unsafe?

I work in a retail store and the manager is now making the employees that work the closing shift take the daily deposits to the bank at night after the shift. It is usually at least after 10pm and I do not feel comfortable doing this for safety reasons as well as the fact that we are "clocked out" and are doing this on the way home on our personal time. Wouldn't it be a enormous liability if any of us were robbed and/or injured in process of being mugged while conducting such a transaction while technically we are not "on the clock"? Because of cutbacks on payroll and reduced hours we are supposedly no longer have the time to take deposit in the morning I don't feel comfortable in anyway at all doing this and want to know what legal rights do I have to support my decision to not do this?