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spray some WD40 via the tube into and around button and keep pushing gently should free up. ensure to wipe away any residue spray at once. once its open remove take apart and clean away oil with kitchen towel then apply silicone spray or a little petroleum gel or renew if U/S

if you can reach in to the catch from another door/draw spray that also.

other option is to force it open and hope the plastic gives before the door structure.

Good Luck