How to disable auto-login in WSL distros?

I have an Ubuntu distribution running on WSL. Every load, it opens my user lraj22 by default. Using an /etc/wsl.conf file, I set

[user]
default=

It still opens up my user profile. If I set it to root, it opens the root profile, and if I set it to some non-existent user notarealuser, it errors and goes back to mine.

If it’s possible, how do I disable the auto-login feature on WSL distributions (specifically Ubuntu)?

Note: For reference, the question How to set default user for manually installed WSL distro? shows how to set the default user. I’m trying to unset the default user, so that it asks for a username/password in order to access the system.