Lubricate the handle where it goes thru the door. May need to get penetrating lubricant and saturate if for a few days and gradually work the handle until it loosens up. Always keep ALL hinges, handles lubricated. Do periodically. Moving parts require lubricant, otherwise, you risk them seizing up. Usage or lack of is a big part of that occurring. You also, have two washers welded inside and outside. Get the lubricant behind those washers.