Similar hardware here and 2.2.12 is locking the door properly.
(scsi0) <Adaptec AHA-294X Ultra SCSI host adapter> found at PCI 10/0
Vendor: TOSHIBA Model: CD-ROM XM-6401TA Rev: 1009
Type: CD-ROM ANSI SCSI revision: 02
Detected scsi CD-ROM sr0 at scsi0, channel 0, id 6, lun 0
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