Apocalypse was simultaneously fending off Magneto's metal barrage, Storm's lightning, Cyclops eye beam, while fighting professor X on the mental/astral plane. Then Beast tries to jump on Apoc and gets tossed aside. Apoc's "shield" was purple like when he used teleportation, so IMO it was more of a teleporter/nullifier shield because where did the tons of metal go? So mjolnir will disappear just like everything else. Thor has no way to win.