Any way to revoke old key pair?

There is a many-year-old 1024 DSA key in the public keyservers under my name. There is a 2048 ELG-E subkey for it. I didn't create these keys, they were created for me by a former employer without my consent. I don't have the private key and it apparently has no expiry date. (Just brilliant). I know there is no way to remove them from the servers, but is there perhaps a way to crack them and issue revocation certificates? Is the cipher sufficiently aged/small to reasonably be able to crack them these days? I'm not really much of an encryption head, I only realised this when I started getting incomprehensible emails, so any help is welcome.