W123 without central locking – how to open doors from the inside?

Hello, a probably simple question: How do I open the rear doors on a W123-limousine without central locking when they are locked? Can you pull the small locking pin up again (ala Golf II) or do I just pull it through the door handle inside? The latter would be extremely impractical, but it looks to me as if the locking pin has completely disappeared when the door is locked, so you can’t pull it out manually. It’s about a vehicle of the 2nd series (built in 1980). I think the locking pins were longer in the first series and looked out even in the locked state. Thanks and greetings