Just ask a staff member to lock it for you. They will do it in seconds. Simple as that.
Okay. That is a way to do it, yes. But what I'm suggesting makes the both of our lives easier since I don't want to bother staff members for such miniscule things that I could do in the matter of seconds if I had the ability to do so. And staff aren't readily available at all times either. It's just quality of life, and by your comment, I'm just going to assume it wasn't a "no support" since nothing negative was said about the suggestion rather than the current solution.