Nissan Primera P11-144 ignition switch

I was finding it very difficult to remove my key from the ignition switch.  I little squirt of WD40 into the switch was all it needed. 

It's not the switch that's worn, it's the key.

Remove the tailgate lock, take it to a locksmith's and they will cut you a key to code and can transfer your immobiliser chip to the new blade. That key won't be worn and you should be back up and running. - Cost? Significantly less than a lock set and less work than changing the ignition barrel. Actually, if they have a Lishi NSN14 2 in 1 and are decent locksmiths they can use that to decode the lock in situ, but it usually costs a little more than to pull the wafers from the lock and decode them to get the key number.

Or Nissan can cut you a key blade for the car and program it to the vehicle. Either way works.

Worst case - if the lock itself was worn then the locksmith can strip it, fit new wafers and get the original key blade to work properly. Being a P11-144 it's an integrated key and fob, the blade detaches from the fob section and the immobiliser transponder is glued into the blade section. It's not hard to transfer, and since you are replacing the key due to wear it's not like you need to keep the old blade available as a spare.

It sounds like a worn ignition barrel to me, I had the same sorta problems on an old Primera.. Only fix for me was a new ignition barrel set (Nissan only) and at a whopping £200 all in

Just to add.. That was £200 all in fitted by a garage etc (many years back now).. Not just £200 for the parts.