WIBTA to teach a lesson?

I (31)M have been with my gf (36) for going on 2 years. We started dating late into 2023. I would often spend nights over at her place, since I had roommates, until we moved in together. Everything was pretty decent except one major thing. She kept leaving the front door unlocked when she got home. Something that I kept warning her about and asking her to stop doing, since we live in a large city with a high crime rate.

Normally I had no issues going behind her and checking. For the first year, since she worked a late shift and I have sleeping issues, I would make sure to get up and check the door after she went to sleep. However at the beginning of this year some medical issues came up and I spent a few months in the hospital. Well I’ve been home a few months and with a disability now that makes it hard for me to walk.

Now the issue is, she still works late, and is not locking the door behind her when she comes home and I can’t always get up and check the door. Today I marked the 4th time this week I woke up to find the door unlocked. Keep in mind we moved to a new apartment and this door doesn’t catch well so it can come open with a strong wind. It has done so on several occasions with us sitting in the same room.

Now after constantly bringing this up, and her saying it takes time for a person to change their habits amongst other things, I want her to actually see what could happen. I talked to a friend and suggested the next time it happens, I call them and they come over and load up all our valuables and hold on to it for a few hours so she see what could happen. However based on how she handles basic talks and goes into a depression and calls herself the worst gf ever, I know she won’t react well to this. WIBTA?