Pontiac 2003 Vibe - Manual (Page 82)

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Ignition Positions
With the key in the ignition switch, you can turn it to
four different positions.
NOTICE:
If your key seems stuck in LOCK and you can’t
turn it, be sure you are using the correct key; if
so, is it all the way in? If it is, then turn the
steering wheel left and right while you turn the
key hard. Turn the key only with your hand.
Using a tool to force it could break the key or the
ignition switch. If none of this works, then your
vehicle needs service.
LOCK (A): This is the only position from which you
can remove the key. This locks your steering wheel,
ignition and automatic transaxle. Push in the ignition
switch as you turn the key toward you.
If you have an automatic transaxle, the ignition
switch can’t be turned to LOCK unless the shift
lever is in PARK (P).