Broken boot lock

[Dewain@aol.com]

I have a 78 B, and when I tried to open the boot today,
the lock barrel came out with the key ! 

All the mechanism inside seems to have fallen away - I tried to
open the boot by pushing a screwdriver through the small hole
where the retaining screw used to be, but with no success - does
anyone have any ideas ?

David 
78 MGB