I think your lock cylinder is a generic SC1 or KW1 or Y1 keyway, the lock is probably made for Manko Window and Door company, and is probably a mortise cylinder that is screwed into an aluminum frame glass door. You can remove that cylinder and walk into a locksmith shop and either get a replacement cylinder from any lock brand out there, or ask for that old one to be be keyed up. I will tell you that the cylinder you have is $10 dollar junk... so if you're looking for any security or key control you may want to ask about Schlage Primus, Abloy, BiLock, or Medeco high security locks.
PPG Glass does this as well on their doors and windows, you'll see the occasional mortise cylinder with a PPG logo stamped on it.
Here's Manko's site:
http://www.mankowindows.com/