Depends on the car. However all had manual ways to unlock. And you have to hold the button on the power lock to keep it locked.
She could have got out of the car. Roll the window down. Go over the seat and out the back door. The lock story stinks.
The significance of his supposedly locking the doors is being flipped upside down. He locked the doors so no one outside could sneak up and interrupt the proceedings. It wasn’t about keeping her in, even though that’s the conclusion that she and her handlers now want the public to draw. To me this is more evidence that IF something happened in that car, it was consensual. That’s why she didn’t tell her boyfriend about it. That’s why she had Moore sign the yearbook (in order to memorialize the tryst). That’s why Moore used “Love” which was a coy reference the encounter.