Toyota Previa 1994 150000

My previa's driver sider door isn't opening. It sometimes opens from the outside, but never from the inside. When I pull the lever on the inside door handle, it doesn't seem like it's connected to anything and just sticks straight out without retracting back to its original position. It closes normally, opening it is the problem. How can I resolve this? What do you think is the problem? I got it estimated and they just said it's a broken lock. Is that true? Thanks