Checked that you are unscrewing it in the correct direction? Both pedals unscrew in the same direction - toward the front of the bike if memory serves.
Yep, handily shimano place an arrow as a guide. Will wait for my neighbour to get back and see if they have bigger hammer.
@TRA started
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Checked that you are unscrewing it in the correct direction? Both pedals unscrew in the same direction - toward the front of the bike if memory serves.