"Ignition lock will turn without key"
The Lock will rotate once the key makes the Tumblers passes the Shear line for initial locking of the cylinder. That is normal.Not Normal
is removal of the key w/o locking....
SOME keys can wear so keys are easy to remove w/o locking the cylinder.
SOME keys can do that easy w/o a lot of wear even then.
Wear of the lock parts or poorly made locks doesn't help.Why?
Because of key shape when they hit the tumblers.
In a very short version... (Long version watch Lockpickinglawyer etc on YT)
Let's say Tumblers height are labels 1 - 5 w/ 1 is shortest and have 5 tumblers.
If you have a key for tumblers 54321 counting from the tip of key then easy to remove w/ little wear.
Some others could do the same like say 32321 etc.
But If you have 53125 13541 etc even 12345 likely will never see same problem.
You should replace the lock when you have this problem.
Is often a sign of lock wear that can fail w/o more warning and strand you at worse time.
Often Get Lock Plate Puller and SW puller for "free" at AZ and other "loaner tool" programs. If you fail to return the tool in X days you lost your deposit and own them.
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave