I feel a bit stupid that I can't figure this out, please help with your practical common sense.
I am used to Yale locks which lock from outside if you close them and you can open from inside.
What I have got in my current home is different. A PVC door that you have to lock with a key from inside. If the key is in the lock inside you can't unlock it from outside.
I leave the door unlocked during the day and lock it in the evening.
I'm in the habit of leaving the key in the door overnight because I want to be able to open the door without searching for a key but this meant an unexpected visitor was unintentionally locked out.
I want DS to be able to open the front door in an emergency. At present it's just the two of us.
What is the obvious answer?