Locked Hatch found being open by itself?

[DnALANGE]

BLOCK box.
Go to entities -> Technical -> Blockbox.
A block box is just a "invicible" box.
Put that box really close underneath your hatch. { also make it a bit small \ thinner to look better if players would try jumping to it. }
SO the hatch is "hanging"on the block box.
WHen the charactor has finished th quest do this :
SetEntityActive("YOURBLOCKBOXNAMEHERE", false);
THEN if you did it correct the hatch will open.
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Try that and let us know if it works.