not able to open my downloads through terminal in Mac OS

DEVs-MacBook-Pro-3:~ dev$ ls
Desktop         Music           Python
Documents       OneDrive        Samsung
Downloads       Pictures        data.ipynb
Library         Pipfile         notebook cv.ipynb
Movies          Public          opt
DEVs-MacBook-Pro-3:~ dev$ cd Downloads/
DEVs-MacBook-Pro-3:Downloads dev$ ls
ls: .: Operation not permitted
DEVs-MacBook-Pro-3:Downloads dev$