Thank you very much everybody. I didn't expect that many replies so soon. I really appreciate it.
Looks like I have several options here. I will see if I can find a key. Next week I will visit a few RV stores. The problem is they close to early for me and I might need to wait till next weekend.
There is one thing I forgot to mention. I'm missing the side door from the hot water compartment so I'm going to have a buy a new one with a new look which means I might need to replace all the locks so I won't end up with 2 keys. I will make a decision based on cost vs benefits as I don't want to spend too much on this issue.
All the best