It probably is not the key. It could be the battery or starter.
Try lubricating it with powered graphite. If that does not work then the ignition tumbler assembly may need replacing. They do wear out over time. Of course you may be using the wrong key.
Physically has a turning problem ? Try your spare key and still has the problem? Replace the ignition switch.
The key and the ignition lock are badly worn. Try a different key if it doesn't fix it you need to replace the ignition lock.
By turning the ignition key...
So it would seem. If the ignition is in the column it may also be jammed by the steering wheel lock. Try turning the steering wheel and holding it while turning the ignition key.
With a key, by turning on ignition
It is a clicking sound
Most of the other forums say to "insert key and tap the key with something while turning it" and it has worked for several. It worked for me but it is just a temporary fix because it will happen again. They say you will eventually need to replace the ignition tumblers.
AnswerIf the key will rotate in the door locks, but not in the ignition switch then the key is not going in all the way due to debris in there, the steering wheel lock is binding the ignition lock (fix by rocking wheel back and forth while turning key) or mechanical failure of lock internals.
try turning the steering wheel to the left or right and holding it there while turning the key
If you can not unlock the steering wheel after turning the key in the ignition, or are having trouble starting the car i.e. not being able to turn the key. The issue maybe your ignition cylinder. I had this issue my self, 03 zx3 . They easiest fix would be to goto your local ford dealer and have a new ignition cylinder put in and while your at it have a spare key made. They're plenty of after market parts or Diy but after doing so you will need a key for the ignition and a separate key for the doors. Dealers can program your new key to work with every thing.
Unlock the ignition? Is the key not turning? This car has a steering lock, but if the key is not turning you probably have either a bad key or a bad EIS (electronic ignition switch) make sure you check it with BOTH keys first, if you have another one.
TRY TURNING THE KEY OVER.