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Having two different keys is a royal pain. Just hose the lock full of
Lock-Ease and wiggle the key around. It will free up the gunk that's
preventing your lock from working correctly. It's messy (graphite) but
it really fixes locks. I use it on all five locks every year. I got it
at a locksmith, or a hardware. It has lasted for several vehicles.

'Curly'

Before you go nuts trying to deal with the lock cylinder, consider
whether all of your keys are worn (or perhaps improperly cut). The
dealer can issue a brand-new key based on your VIN number for just a
couple of bucks. They just did so for me, and it works great. Helluva
lot cheaper and easier than mucking around with the cylinder!

There is an eject button on the key assembly you can push in and
eject the key cylinder. To do this, slip the  key in, turn to ON and press
the recessed eject button the size of a pencil tip with a paper clip. Take
the cylinder out and look at the tumblers, if it's out of alignment file it
down and problem solved. Your first try to remove the cylinder should
be hard compared to 3 seconds for me.

One other method that might work is the ink pen and trial and error
method. I will leave this to your imagination.

I believe so. I believe this route requires an angle grinder, drill or the removal
of the steering column.

Thanks to all those who responded. I will take note of all your comments and
suggestions.