Auto logout user (TTY PTS) after a period of inactivity
Ability to terminate interactive sessions after a period of inactivity and allows users to terminate their own authenticated session.

TMOUT variable to a number in seconds you wish for bash/shell to wait before automatically logging out the shell if no command is run.
For example 10 min

vyos@r14:~$ sudo cat /etc/profile.d/autologout.sh
#!/usr/bin/env bash

TMOUT=600
readonly TMOUT
export TMOUT
vyos@r14:~$

After 10 min

vyos@r14:~$ timed out waiting for input: auto-logout
Connection to 192.168.122.14 closed.
$

Proposed CLI

set system login autologout 300