those keyboards are capacitive or resistive keys. For resistive, you push a carbon pad down on top of two pcb traces. The click is generated by the mechanism and not by the switch. That is silent. Desktop keyboards are much larger and can usually be taken apart to clean surfaces and revive the switch function. Laptop keyboards MIGHT be fixable. New keyboards are relatively inexpensive.
I would research a source for a new one, then attempt to disassemble and clean the old one. If it doesn't work, order the new one.