Curiously there are actually locks, operated by flicking a little tag next to the interior handle. I'm not sure of the purpose.
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Those internal lock toggles allow you to lock the doors so you don’t get robbed when you stop at traffic lights for instance.
I also make use of them to ensure that the doors are fully closed before we set off. If you don’t pull the door hard enough it looks to be closed but only holds on the first catch which can easily let the door fly open when you go round a corner. In that case, the lever will only go half way round the quadrant, whereas when the door is securey shut, it will reassuringly go the whole way. We regularly adopt this procedure as part of pre flight checks.
