Does Front Desk at a hotel have to do laundry if it was not in the job description or without a pay raise?

Nope, they don't have to do laundry if it's not in their job description. If they start getting asked to do laundry without a pay raise, they should kindly remind their manager that they were hired for the front desk, not the laundry room. And if the manager still insists, well, that's a load of dirty laundry they need to address.