Technical Fix trunk lock

[MultiRacer]

Hey,

So my Lancia has a problem with the trunks lock... When I put the key in it I can not turn it. So I removed the thing from my car and the whole lock was corroded... I put it in a cup of WD40 and let it in there for 1 day... Still no result.
Anyone know a solution..?
The lock might be the same as the ones puntos have..

Here are some pics:
http://imgur.com/a/GXGgg

 

[digger58]

Soak it in used brake fluid