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I had this once with an spd-m something. After the allen hole was rounded the only thing I could do was pull the crank, remove the pedal body, grind two flats in to the spindle with an angle grinder, clamp the flats in a vise and wallop the other end of the crank with a lump hammer.
You could try clamping the crank arm and hitting the allen key - impact can be more effective than the progressive application of torque, hence the impact gun or manual impact wrench
and before you do that, heat it with a camping stove, gas hob, or something better designed for the job like a MAPP torch; needs to be hot enough to sizzle water at least
gilmo789
Tips on getting a stuck spd off a crank with only the allen key. Tried plus gas soak and a mallet on the key . Wopping adjustable but no purchase ? Plus a pipe extension.