Stacey, when a washing machine won't drain, there's is always a possibility that the drain filter is clogged. The drain filter is designed to catch lint, stuff left in pockets and all the other things that find their way into the washer (even socks etc:-) Your Whirlpool washer may have a drain pump filter. If so they are usually easily to access and check it. Before you go to check the filter, take a look at the drain hose behind the washer to ensure it isn't kinked or otherwise obstructed.
My whirlpool did the same thing so I replaced the door lid switch. It cost me less than $10 on eBay, I then watched a video on you tube on how to do it and it was a 10 minute job, good luck!
