How do you unlock 2002 Cadillac deville ignition the key goes in but does not turn?

If the key goes into the ignition but doesn't turn, it could be due to a few issues. First, ensure the steering wheel isn't locked by gently turning it while trying to turn the key. If that doesn't work, try using a different key if available, as a worn key can sometimes fail to engage the ignition. If the problem persists, it may be a sign of a faulty ignition switch or a malfunctioning steering column lock, which may require professional assistance.