Key on a hand auger blade is that there has to be a "BURR" on the ice side so that it catches the ice. In other words, you sharpen from the top side only. You can use a sharpening stone with oil, or a very light touch on an angle grinder with a fine stone. you will need a spare set anyway, so buy a new set and sharpen the old. Keep the old set taped up on the cutting edge so you don't do any damage with the blades flopping around in your tackle box. No fun reaching in and rummaging around and getting a surprise the hard way.
Drewski
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