A front-loading machine for treating laundry includes a loading opening, a hinged door, a locking mechanism and an operating device. The loading opening is disposed on a front wall of the machine. The hinged door is receivable by a receiving area on the front wall so as to close the loading opening. The locking mechanism is configured to hold the door in a closed position. The operating device is configured to activate and deactivate the locking mechanism. The operating device includes a sensor configured to detect a contact or a contact-free incursion into a detection zone thereof. The sensor is disposed on at least one of the door and the receiving area on the front wall.