Help ?

Hi all, I recently inherited an old RC Cola machine. Unfortunately it is locked and I don't have a key or a parts manual for it, although it appears to work ok when I plug it in. Does anyone know where/how I can get a hold of these items ? The nameplate info is:

Vendorlator Mfg Co
Vendo Company, KC, MO
Model #VFA56C-B
Serial #511048694
Key #KT841 (from lock)

Any info about this would be helpful. Thanks a lot.

Vinnie