How do I remove plastic retainer from defroster duct, driver's door panel? on 1999 Buick Park Avenue

Driver's door handle doesn't work. I have attempted to remove the door panel in order to see what the problem may be. I am unable to remove the plastic retainer and clip. I have tried a screwdriver, needle nose pliers and putty knife. Short of bringing to dealer, how is this properly removed?

Thank you.

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