You could get a locksmith to make a key for you. As long as the cylinder is working properly they should be able to do that.
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If your have decided to replace the switch, removal can be accomplished with a auto body dent puller. Run the screw of the dent puller into the key slot and use the slide hammer to remove the barrel of the lock.
The lock could simply be frozen. Thaw it out. Alcohol heated is one possibility.
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There is no worse heresy than that the office sanctifies the holder of it. John Dalberg, Lord Acton
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Actually, the dent puller is unnecessary and would possibly damage some stuff on the triple tree. A mobile locksmith will cost more than a new ignition switch, but would be less work. To remove the switch with it in the locked position, you have to remove the triple tree and use a screw extractor to remove the one-way screws on the bottom. If the switch is bad, I'll simply replace it. I can get the three lock set (Ignition, gas, trunk) with 2 keys for $40.
I hadn't thought about it being frozen. That might be the case. It doesn't sit out in the weather, unless it's being used, but it could still have moisture in the tumblers.
"In questions of power then, let no more be heard of confidence in man, but bind him down from mischief by the chains of the Constitution." - Thomas Jefferson
If you are looking to actually get a new physical key to work, then you can not do it yourself. The key must be cut by a Locksmith and the transponder chip on the key must be matched to your vehicle via a special programming tool. A good locksmith will have this device, as will the dealership. They can be bought but run anywhere from $70 on up depending on the unit. Better to get a local Locksmith to do it for you.