French doors. How to get ventilation with security.

We have French doors opening onto a balcony in two bedrooms. The last couple of nights have been pretty warm, but with a cooling breeze blowing in later in the evening. We don't have A/C in one of the bedrooms and I was wondering how we could have an ending in the doors to allow the breeze in, but also prevent someone from outside from wandering in. I'm not generally paranoid about security, but when it's my kid's room opening onto a balcony with a set of stairs it is not at all secure so I've been shutting the doors after bed time. the main bedroom is ok becuase I can open the ensuite window for a cross breeze.

currently the doors have the barrel bolts that push into the floor. I could drill a hole in the deck and lock the door in the ajar position, but want to be able to shut it without too much fuss in the middle of the night if we get a southerly blow in or it rrains.

I thought it it might be possibly to install an awning type window in the door but seems like a lot of trouble.

any ideas?


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