If you did suck up some leaves then maybe a shop-vac will work to suck them back out. However, the suction side of a pool pump produces way more suction than a shop-vac and they may be really jammed in the pipe. Worth a try though. You can also stick a garden hose in the inlet to the pump basket and pack some rags or something to give a tight fit and see if water pressure can blow the stuff out the skimmer. One reason to always use the skimmer basket.
Al