Car locked help
This might work, from inside the car manually lock all the doors except the drivers door, with key in hand, exit the car and close and using the key lock the drivers door, watch the dome light and when it goes out wait at least one minute, using the key unlock the drivers door, get inside and see if it will start and run, if it does then your done, but if it is still in lock out mode then the dealer will have to reprogram the security system, make sure you also have all the keys and fobs with the vehicle so they can make sure the system reconises them and let's you drive the vehicle.
Try a spare key if "tennisshoes" method doesn't work.
Have you removed the radio/stereo head unit at all? Or have you disconnected any wires/plastic connections anywhere on the vehicle? If you can get the car to turn on (not start the engine, just key in the "on" position) plug in a scanner into the OBDII connection below the steering wheel and retrieve all codes.
Looking for a Used Malibu in your area?
CarGurus has 1,911 nationwide Malibu listings starting at $2,995.
Search Chevrolet Malibu Questions
Chevrolet Malibu Experts