Oil filter wrenches work great to open stuck jars. It's the tool designed to do the exact same task, but on an oil filter. I'm baked and this is blowing my mind,
Oil Filter Wrench, Adjustable Filter Removal Wrench, Suitable for filters with size 55-75mm/2.16"-2.95",The short handle is perfect for narrow spaces,For Engine Filters of Auto (55-75mm) : Amazon.co.uk: Automotive