How can I open a locked door on 78 Cadillac?

one of the rear doors is locked and I cannot neither unlock it, nor open it, is there any way to get a locked and closed door open to fix the mechanis

one of the rear doors is locked and I cannot neither unlock it, nor open it, is there any way to get a locked and closed door open to fix the mechanism?

or:one of the rear doors is locked and I cannot neither unlock it, nor open it, is there any way to get a locked and closed door open to fix the mechanism?

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