Locking a directory

For privacy of my data I wanted to lock down /downloads on my file server. So I ran:

chmod 0000 /downloads

The root user can still has access and ls and cd commands will not work. To go back:

chmod 0755 /downloads

Apt error Could not get lock /var/lib/apt/lists/lock

  sudo fuser -vik -TERM /var/lib/apt/lists/lock  

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