Found the problem...

I did some investigating on this problem. I thought it could be the locks freezing up due to age/wear, etc. However I remember lubricating these parts last week and everything was fine and in working order. I noticed that the knob that you pull to lock and unlock is lose, as if its not connected to anything. It just falls straight back down after you let go. I remember a while back when I removed the door panels to place the speaker wires, how the locking mechanicism looked like. I figured the part where the locking knob attaches to the brass colored rods that lock and ulock the doors has either broken off or came undone. So I came up with an idea just to see if it would work. I screwed the knob back into place and pushed the door panel down as much as I could without breaking it. Then with the other hand I pushed the knob down as much as I could. When I did this.. I hear a click. I gently pulled the knob up but it came undone. I kept repeating this process several times until I heard a nice click and the locking knob stayed up. I pulled the knob up and I opened the door. I quickly removed the door panel and found the problem. The part in which I thought was the problem was indeed the problem. Its a small clear/white plastic piece that has three points to it. The rod hooks onto that piece at the end. One of the points broke off causing the knob to lose contact with the locking rod. So, I used the other 2 points by placing the rod in between these 2. It works fine now. I am glad I finally figured this problem out. My next mission is to fix my driver's door window. Its makes a bad clicking sound once it reaches the top and there is a tiny gap at the top as well.