I agree with you and I would have knocked on the door or found another solution. But for some reason, LB didn’t think that it was such a problem leaving the keys there and she did think that knocking on the door was a major problem. Since I’m not her and I’m not in the situation, I wasn’t sure that I had enough information to tell her what she should have done. I felt like there were too many unknowns here. Why did she not think it was a big deal? Is the door to the building kept locked at all times and they live in a very safe neighborhood? Did she have reason to believe that he would notice soon? Why was she so uncomfortable?
The main issue is that if she felt so uncomfortable, I felt uncomfortable telling her to knock on the door. Especially since I don’t know her so it’s hard for me to know where that discomfort is coming from and how justified it is.
Personally, if I had felt uncomfortable knocking on the door, I probably would have tried to keep an eye out to make sure that he eventually brought the keys in (and not someone else). Which is why I asked her if the keys were still there.