Your key/keys & Ign Barrel will be worn. Common problem with this range of ign's.
We see lots in the shop, having a big bunch of crap hanging off your key is the locksmiths friend. The swaying/swinging action over time giggles the key around it the dicast housing accelerating the wear in the housing.
Good new is you can buy these uncoded kits
and and repair it your self.
But it's not worth just doing the barrel without the keys.
If you send me a good pic of your key blade I can decode it and give you the code/cuts for the wafer sequence.
Is your key the non remote type or does it have the remote buttons in the head?
I'd get either a shell you can swap the remote part over. If it's just a plain key, get your old one cloned onto a new blade cut to code.