How to continue script commands, functions & variables after chroot?

I have written a BASH script that would prepare and install everything during ArchLinux initial installation. The script would work fine and execute everything successfully until it reaches the arch-chroot command then it would stop.

Also, the solutions I found online (like the EOF trick) wouldn't pass functions or variables after chroot.

Here is a demo:

#!/bin/bash

username=test
pause_var=1

pause ()
{
if [ $pause_var -eq 1 ]
then
    read -n 1 -s -r -p "Press any key to continue"
fi
}

arch-chroot /mnt #the script stops after executing this line!!

# some commands after chroot
useradd -m $username
pause

echo $username:123 | chpasswd
pause

# ... more commands below

I googled for a solution but none of the solutions that I found have worked for me. I'm a Linux noob.

Thank you.