General Purpose. The drive thru operator is expected to sell to and service drive-thru guests and collect for each meal prior to serving it. Essential (primary) Functions. The primary responsibility of the drive-thru operator is to sell and service each drive-thru guest within 3 minutes or less by administering the 7 steps to Drive-thru while maintaining guest sensitivity, cleanliness, restocking, sanitation, uniform, safety, security, cash and c...