2008 Mazda 3

2008 Mazda 3 4 cyl Four Wheel Drive Automatic 5000 miles

I can turn my key in my car door and you can see that the knob is on red for opening the door but it will not open. It can only be open from the inside of the car. The key does open the trunk. I do not have power windows.
what do you think the problem might be?
November 15, 2008.

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