A cooker device includes a main body that defines a cooking chamber and that defines an opening at a front of the main body, a door configured to open and close at least a portion of the opening, an opening assembly configured to apply force to the door and cause the door to pivot relative to the main body based on the force, a proximity sensor configured to sense a proximity of an object located in front of the cooker device, an input interface configured to receive an opening command based on the proximity of the object sensed by the proximity sensor, a control unit configured to, based on the opening command, control the opening assembly to apply force to the door, and a display that is configured to indicate an operating state of the cooker device.