key problems on 2003 Buick Rendezvous

i can not get my key inside the start, or ignition, is likely lucked.

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1 answer 1 comment
Try another "spare" key in case your key is damaged. Try lubricating the lock/ignition switch. The mechanical tumblers in the lock itself may be damaged requiring the ignition switch tobe changed.
how do i change this switch on my own