switch or tumbler? bet you mean tumbler/lock. need year!
you could spray wd-40 in there and work it. switch or tumbler.
either way,
couple of different ways to pull tumblers, depending on where it's mounted. dash or column. in both cases, all but really old corollas,
if it can get to "ACC", then remove covers, depress pin on the side of it, and pull straight out, take that to a smithy.
if you can't get it to the "ACC" position, you have to pull the entire steering lock assem and take that to a smithy. that would require cutting slots for a flat blade screw driver on the two mount bolt heads on the steering lock assem. if it's on the column, the the steering wheel and combo switch need to come off as well as dropping the shaft for access. if you elect to (not required), do not pull the shaft w/o match-marking the splines.
switches are typically one cross point screw on the back of the tumbler and a harness connector and it's in your hands. w/o pulling the tumbler.
best i can do w/o more info.
a free manual for most vehicles can be found here, (usually under "steering/ignition lock-switch".
http://www.autozone.com/
just sign up, plug in vehicle info.