The OP says he's got a vault. That means entry only through the overhead door. That rules out sticking a screwdriver through the track and such. If I read it right and it is vault access, the only way to lock it is by standing outside the door. There is a good trick with using the old dead door opener to keep it locked, but it's a PITA to unlock over and over. It also involves a wire coat hanger, and they be scarce puppies these days. One really kludgy thing I have contemplated in the past is using a cane bolt, the type that pushes down into a hole drilled into the floor and is usually found on the dead side of double doors or gate, and run it horizontally / sideways into the outer door jamb. The cane bolt gives more travel into the hole than a sliding door bolt would. Use carriage bolts and get one that will accept a padlock. OR (this one is fun): Run a snug fit 2X4 vertically from the ground to the top of the opening. Put a hasp plate or padlock ring on the door panel and one on the 2X4 so when the door is closed they line up enough for a padlock. Do that at the top door panel and the bottom door panel. The door will not open for two separate reasons. One, the top panel will not be allowed to bend back and two, the 2X4 will be forced to rise and the whole shebang will immediately be stopped as it hits the head of the opening. Perhaps a beheaded bolt could be driven into the top of the 2X4 and the assembly then inserted into a matching hole overhead to further locate the parts in a secure manner. Clear as mud? This has been done before.

Maybe Repose Gray, Krypton or Folkstone, but you'd have to check with sample cans. The way they look on my screen with the brick/mortar could be deceiving. Krypton could be a bit too gray. Portrait Tone and Decorous Amber both lean a little too orange, unless that's what you want. Can you post a better picture of the metal security doors? Offhand I'd say you don't want them to be a different color than the door...if they have to stay. It would be nice if someone here could do some mockups for you. I'm not good with that.

If you want a chic look, you can paint garage doors and front door black. Ideally, also the windows borders. If you want a more charming country look, you can choose a forest green color. I do phone consultation if ever you need me to do a research and give you the perfect color code! Best regards, Ariane Boisclair

I like the color that you have, however, your door doesnt show up very well. I would paint that a much brighter color, so your front entry is more noticable.