Mac Air locked disk

My Mac Air hung the other day and would only boot with the flashing question mark whichis a very terrible sign. I was able to hold the option key and get back into the disk diag screen. It says the disk is ok but you cannot select anything other than verify. I tired to do a re-install of Mac OS but it says the disk is locked. Is there anything that can be done? I have never seen an error like this before. I can install Mac OS on an external drive and the basic hardware all seem ok except it does not see the SSD so my concern is that my SSD is toast. If anyone has any ideas it would be great

There are several ways to back up a Mac that is not fully functional. You need an external hard drive to hold the backup data.
1. Boot from the Recovery partition or from a local Time Machine backup volume (option key at startup.) Launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
2. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
3. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.

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