Rusty lock

@ Wools

Maintenance
What kind of maintenance does my Kryptonite key lock need? We know you are either riding your bicycle around town, cruising down the highway on your steel steed or bombing around down some trails where your lock could pick up all kinds of grime. Lubing on a monthly basis should keep dust and grime in check and out of your cylinder. Lube ingredients need to include one of the following: Silicone, Graphite, Teflon or Paraffin. These are commonly found in bike or powersports shops. Spray or drip a few drops of lube into the cylinder, insert the key and make a few turns to work it in. You should be good to go so you can get back to your adventure.
http://www.kryptonitelock.com/CustomerService/FAQ.aspx

basically just lube it up!