I imagine that Odin could destroy it in the movies if he had a mind to. Just never had a reason. It also showed in the film that Hela once wielded the hammer before the worthy enchantment was a thing.
Hela is also probably acting on other powers other than just purely physical but who knows for sure?
Enchantment was weaken due to Odin's death. Hence enable Hela with same Asgardian magic to destroy Mjolnir.
Odin force was not fully Thor force which i believe still resides back to asgard to be chosen to wield it.
Hela also in movie derives her power from Asgard.