There should be a unlock all / lock all for selected layers and groups with an option to include child layers.
You can use this dialog with this settings on parrent folder. (works only for layers inside, not folders).
Top menu > Layer > Lock all layers in group
You can use my script in link above and set him shortcut.
This feature is messed up because it can't work with groups. So it's not corectly implemented.
Combo: Ctrl + G, Ctrl + G, Ctrl + Shift + G, click on full-lock, click on full-lock again, Ctrl + Shift + G
works much bulletproof if you didn't exhaust groups nesting levels. (you must click on lock, slash key works only for single layer)
Use the following shortcuts to lock and unlock layers in Photoshop CC 2014.
• Command + / (Mac) | Control + / (Win) toggles between locking and unlocking all selected layers. (Clicking on the lock icon will also unlock a layer).
• Command + Option +/ (Mac) | Control + Alt + / (Win) unlocks all layers (except the Background layer).
• In addition, there is a new menu item Layer> Lock Layers.
Specific to locking Shape layers:
• If a shape layer is locked, it now behaves properly and cannot be selected (in previous versions it could).• When a Shape layer is locked, the Shape Properties in the Properties panel will be disabled.