I tried the "Erase the Solid State Drive in the HDD bay" BIOS feature following these instructions. The message "Now erasing… It may take about 6 minutes." came up. After waiting over three hours, I dismissed the warning to not turn off the laptop. (There wasn't much else I could do.)
Now my X301 laptop just hangs at boot. I can't even get into BIOS setup or select a boot device. I think what happened to me is similar to this story, however, I can't even tell if my SSD is password-locked.
If I physically disconnect the SSD, I am able to get into the BIOS setup and even select a boot device. The laptop functions fine when booted to Ubuntu installed on a USB drive. So I am pretty sure the problem is with the SSD. Thus the questions are, "Did Lenovo BIOS secure erase brick my SSD, and how do I make the SSD functional again?"