Well hard to turn just might be bad key cuts in conjunction with bad lock cylinder pins. Can you still use an original keys that turns just fine or does that one screw up now as well? Per the wiring diagram for your vehicle when the key is turned on The pink wire from the ignition switch provides power to anything tied to the pcm and gauges so power for the gauges, turn signals, ignition, fuel injectors, pcm and engine sensors. So that means that if your guages come on and lights and such, but your ignition does not, then it is really not the switch that has the issue as it would have killed that whole shebang. After it leaves the switch and passes thru the big connector at the bottom of dash it splits into several directions to go to various fuses. Next time it will not run leave the key on and probe the IGN-E, ENG-1 and PCM-1 fuses in the underhood fuse box. All should have power when key is on and this would be when probing the terminal of the specific fuse that is closest to the relays.if one of them is dead while the others work you likely just have a wiring issue. BTW I assume you mean you can crank the engine but it will not ignite and run? Also do you have a light that says security? I ask because on keys for the passlock system would not have a key that you can really any mods to it like a resistor chip. On the passlock system it is the lock cylinder and surrounding sensor that doe the work. IF you have that light then there is a possibility that the the passlock system is a goof. If that light just stays on or flashes then you need to look into it. Effects can be a no start because the injectors are disables or more often a stall and immediate stall. Just want to make sure you don't miss anything.