No keyboard lock unfortunately and also an inferior keyboard to the X and T series, as well as inferior performance, battery life, build quality and weight. Lenovo reusing this old chassis is the root issue here.
Prices are higher than last year and an obvious sham. Starts at $889 with what is probably dual-core i3, 4GB memory, 128GB sata storage excluding backlit keyboard or windows hello. Not to mention the absence of any business associated features on a "business laptop".
Spec it up to i5, 8GB, 256GB and it is well over $1k, which is ludicrous considering the outdated hardware on this. Better to buy the Spectre x360 13 or one of Lenovo's own Yoga convertibles, which all come with full TB3 ports.
If you found this laptop looking for a 2-in-1 with expandable RAM like I did, the new LG Gram 14 2-in-1 is slightly more expensive but a far better value than the L390 Yoga