Well, the Apollo LM Descent Module was about 4.2 meters wide...
(not counting the legs). It probably wasn't that tall, at least judging from the photo here. Twenty meters resolution wouldn't be enough to see it directly. You might be able to see it early in the lunar morning or just before lunar sunset when the shadows are long, but all you'd probably see would be 1 or 2 pixels. Not exactly convincing "proof" to the skeptics out there. You'd need much better than 20 meter resolution to see anything useful.