Key concerns

THE only remaining key to my 1996 Ford Laser has worn to the point it will open only one door, and the ignition can be tricky. A locksmith tells me this is common in soft alloy keys. The solution is to have a new key cut from code, but Ford says the dealer must provide the code, and the dealer says he can't find it. The dealer wants to change all locks and the ignition at my expense . . . many hundreds of dollars. What do you think?