Van lock latch not opening

[Curtislunt]

Hello,

Hope someone can help, the rear doors on citroen dispatch 15 plate won't open, all the other doors open and lock but the rear door latch is stuck.
Won't open with central locking or manually with key ? Tried l to move latch from inside with a screwdriver but won't budge.
Is there a way to release from the inside?

Any help greatly appreciated

Thankyou

[Curtislunt]

Forgot to add - it doesn't open from the inside either