Just get a hacksaw and a carbide blade (probably a few so you can be guaranteed to finish the job). Hacksaw should take you 15-60 mins to cut the lock (depending on the quality of the blade). If you have access to power tools and a cutting disc a scary 2-5mins should do it.
Don't try and bend the lock off as you'll probably fsuk up the frame.
This is one good example of why Krypto and Abus rock as a lock company because you can always get replacement keys as long as you keep a record of your locks serial number.