you cannot use the VIN like a car, you'll need the key code, it should be a letter and two numbers, such as C20, E45

it can be found either on a metal tag that comes with the original set of keys, stamped on the original key itself(if you have a copy of an original that code is not the key code, its the code for the blank)... if you don't have any of those if its a newer bike a few dealers keep key codes on file if you know where it was purchased originally

if all else fails you need to remove the key lock cylinder, underneath the plastic cover will be stamped the key code itself... some places require proof of owner ship to cut a key, should run you 6-9$, you can also get a lock smith to cut one for you, but you'll have to get a blank from a dealership