I have had this problem before and cannot remember how I did it but I would guess along the lines of. Lens off the camera. Find a suitable grippy surface, cork or rubber. Place lens hood down exert downward pressure on the hood rather than pressing inwards,and twist the lens.
I would have gone about it this way rather than WD40, but that may work. I most certainly would NOT try chilling and hot water.
I hope you get it off OK
Don
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