Wheel locks use many different keys. There is not a “single” master key that will fit all locks. If you purchase a new set of locks the key that comes with it will probably not fit your old locks.
Wheel lock sets come with a lock code from the lock manufacturer. With that code you can order a replacement key. Most will also allow you to register your locks with them so they can supply you a replacement if you lose it.
If you are not able to find the code and you are still able to drive your vehicle you can go to your local new car dealer. If it is a factory style lock set they have a “master” key set and may be able to remove your locks. You can then either purchase a new set of locks with a new key or get the code to order a replacement key.
Going to a repair shop to have them removed can be expensive. Depending on the type of locks on your vehicle there are tools available to help remove them.
There are sockets with individually spring loaded pins to conform to lock designs of pattern type locks.
There are reverse thread taps for internal socket type locks.
There are reverse thread sockets.
Hammering on a socket that fits tightly over a wheel lock can also sometimes allow you to remove the lock.
Chisels and torches may be necessary but may lead to damaging the wheel.
Looking back it is best to have a safe place in your vehicle to store your wheel lock key or spare key where a would be thief would not easily find it, but would be available to you when you need it.
So the bad and the good. Bad if you lose your key. It can be difficult to remove your locks. Good in that it should be difficult to remove them. That is what they are there for.
Worth having them? More on that at: Wheel Locks: are they worth it?