Why should you do this
1. You can’t tell who is using your phone behind you
2. To customize your termux.

Installation
To Enable the Lock Feature in Termux you have to perform list of commands but i have combined all the commands so you don’t have to waste your time copying them one by one and paste it on termux. just copy-paste below command in Termux

“cd && apt update && apt upgrade -y && apt install python2 bash git -y && git clone https://github.com/khansaad1275/locktermux && cd locktermux && bash setup.sh”

How to uninstall it

Just copy and paste the command on your termux: cd && cd locktermux && rm $PREFIX/bin/login.py && cp old_login $PREFIX/bin/login && chmod 700 $PREFIX/bin/login && echo termux-login removed && cd && rm -rf locktermux