If you have an "original" key, there's a 4 digit code stamped on the key. Any dealer can cut a key based on the code, and won't require your worn out key.
Having said that, choose a competent dealer. I had one dealer that cut the keys off the code, and couldn't do it right if their life depended on it. They ended up blaming ALL my lock barrels as defective... RIGHT...
Another dealer made it without problems, and I made copies off that one without problems either.
If you don't have that 4 digit code, a dealer might be able to look it up for you.
VK