what is wrong with my ignituon switch put my key in but wont turn on on 2003 Pontiac Aztek

it just started on Monday I put my key in but it wont turn it is like everything is locked up what can I do

Asked by for the 2003 Pontiac Aztek
Sounds like the key and tumbler went bad (the tumbler is the thing the key goes into). It takes special tools to replace it because the air bag assembly and the steering wheel needs to come out to get to it.