The lock on my focus was sticking a bit even though I lubed it with graphite. So I removed the parts that lock the cylinder. It was easy. Now any focus key or even a screwdriver can be used to turn the lock. This means that I am relying on the electronic chip in the key to keep the car from being started. Those with a manual transmission might want to find out if the car can still be push started without this chip.
How I did it: separate the two steering column covers just behind the steering wheel. The upper one is attached to the lower with some tabs that can be pushed in. The lower one is attached front and rear by several screws. Remove the screws on the steering wheel side with a star driver. You can buy a whole set packaged like a pocket knife for a few bucks at wallymart. Separate the covers a inch or so and locate a hole on the driver's side of the housing that holds the lock cylinder. I used a long thin allen wrench to poke a button through the hole while the key was in the accessories position. The lock cylinder then falls out.
Pry off the clip on the back of the lock cylinder. It then falls out of the second housing. Then you see a lock bar that pops up when you stick the key in the cylinder. On either end of this bar, pry off two staples that hold it in and remove the bastard. Opposite this space, on the other side of the cylinder is a thin metal plate. Pry it off with a pocket knife and all sorts of metal parts fall out.
Put the cylinder back into the second housing, use pliers to squeeze the clip back on to the post and snap it back into the housing attached to the steering column. Now your key will insert without any resistance and there's nothing to jam the lock. Have a shot of moonshine.