'98 SLK230 key sticks in ignition
 

This car has 164k and sat for 2 years unused.
Sometimes, the ignition tumbler doesn't want to let go of the key. I fiddle with it and eventually it comes out. Sometimes it comes out first time.

Would you suggest graphite lock lube? I found a video about removing the spring and pin, which will prevent it from hanging on to the key, but it looks like a hassle to get the lock body out.