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systemd - Auto-lock the computer on a schedule (e.g. at bedtime)

[Unit]
Description=Lock session
 
[Service]
Type=simple
ExecStart=/usr/bin/loginctl lock-session
 
[Install]
WantedBy=default.target

NOTE: Create the folder if it does not exist.

[Unit]
Description=Lock session at night
 
[Timer]
OnCalendar=23:45
Unit=lock-session-bedtime.service
 
[Install]
WantedBy=default.target

NOTE: Modify the log out time as needed.

Take care not to make any other changes to the file.

Run

systemd --user daemon-reload
 
systemd --user enable --now \
        lock-session-bedtime.timer