Amulet of Thieves

This is a dark colored stone disk with a black gem in the center and eight dimly lit runes surrounding it in uneven spacing that hangs from a braided cord of various dull metals.

The amulet has 8 charges, it recharges 1d8 charges daily at dawn. If you are attuned to the amulet you can use an action to expend 1 of its charges to cast one either the Arcane lock spell or the Knock spell.