Lock Ease application note.
NO you don't squirt the stuff into a lock. Well maybe a couple of drops in a padlock that sees a lot of weather.
Shake can. Have paper towel ready. Put a couple of drops on key, just a film on the key.
Cycle key in and out of lock a few times.
Wipe key and cycle once more to remove any excess.
Don't get it on clothing, it will stain.
I've done this, once a year, on cars I have owned for almost 20 years and never had a problem with the locks. The locks work smoothly and resist icing.
I just got an older used car for my daughter that had "crunchy" locks. Two treatments cured the crunchy locks, now they operate smoothly.
Yeah, the trick is not to over-do it.