1984 Mercedes-Benz 280SL - Trunk Lock Wont Open

Mercedes Benz 380SE - 1984 model. (Wrong model picked in the drop down below).
Trunk stuck won’t open. Latch goes all the way. Tried with both valley key and the other set of keys. No luck. Pl.help! Thanks.

You mean you can insert the key, turn the key, but it does not unlock?
A locksmith might have a trick to open it. Or maybe a body shop—collision center have an idea.