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We bought our Toyota Sienna Van in July 1998 and have had problems with the locks on both of the sliding doors and the driver's side door. It is not due to child proof locks; the button you push to open the doors stays pushed in, does not pop back out and the doors cannot be opened from the inside or the outside. This is quite dangerous when you have four children who all sit in the back. They have had to climb over the seats to get out. The driver's door will not lock unless you use your key. The dealer has been no help. Has anyone else experienced this problem?