What does it mean if the key is not coming out of the ignition on 2006 Toyota Corolla

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The key intermitently comes out of the ignition, but sometimes it will not allow me to remove it.
(1) Answer
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you either have one of two problems:
(1) key is worn out (try another one)
(2) ignition tumbler is failing and one day may not start because the key won't turn.