Not that I'm particularly skilled in this, but for fun I once decompiled an Android app that accompanied cheap electronic door locks we had installed in the off

Not that I'm particularly skilled in this, but for fun I once decompiled an Android app that accompanied cheap electronic door locks we had installed in the office. I found the C files that were generating temporary passwords, manually parsed for what I was looking for, then wrote a shell script (with help from a friend) that could find/generate more temporary passwords from any existing temporary password+approximate timestamp pair. About a year later an intern showed me that a coffee stirrer also can work to open the lock, but I bet he won't write about that in a forum.