Need new door key

dealer or an authorized locksmith have key[s] cut by vin number

you can buy brand new oem for about $20.00 online also can check ebay and other locations the old keys use to have a little tab in them and they would pop them out and give to owner dealers can do a vin cut on key but it is cheaper to replace the whole lock with new keys for the older cars
http://www.best-deal.com/search/landing/query/corvette+door+locks/s/yahoo/?utm_source=bing&utm_medium=cpc&utm_campaign=Cars_1&utm_term=corvette%20door%20locks

use vin number at dealer and they can cut a new key also need proof of owner ship

If the old key is worn out and not kicking the lock tumblers over, get the VIN number and registration and take these to the dealer. The dealer will sell you a new key.

remove the rear seat ; if needed; crawl to the back of the hatch and release the hatch lock from inside using a blade screwdriver or, have a locksmith at the dealer make a new key by code using your vin number

not locks ur key is probably worn down if both doors are not opening with key than problem is with key have a key cut and try locks [thats if u dont have a spare key to use ] if new key wont work than wil need to replace locks look in bone yard cheapest online moderate price dealer higher[or use vin number for new key can be pricey ]

you can contact the dealer with the Vin number and they should be able to cut a key for you...or...call a lock smith and he can change out the locks.

No you can not retrieve the keyless entry code with the vin number. However you may be able to retrieve the actual key code and have a blank cut. The only problem is your vehicle is a 98 model and that is the cut off on how far back ford goes so yours may or may not be avaliable. You can have your local dealer retrieve this but they would have to have a picture ID and proof of ownership.
The only other option is to have someone use a jocklock to get it open, it is pretty easy to do on this vehicle.

read the vin number, and have a new door key cut.
the dealer can sell a blank for under 10 bucks
this of course only opens the door and wont start the car.