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In layers panel, Just double click by the left mouse key on it's name
On the layer menu double click the padlock sign to unlock the layer or drag down the padlock icon to recycle bin below the layer.
just click ALT+SHIFT+CTRL+K and than go to LAYERS menu. Click the BACKGROUD, and type your shortcut. (I gave it CTRL+ALT+SHIFT+B) and than ACCEPT and OK.
I also use ‘alt + double-click’ to do it too. This just unlocks it without giving you the dialogue box to rename it. If, however, you do want to rename the background layer, then just plain double-clicking will be the faster option.