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ok, update. The mushrooms are still growing. Very annoying. I've asked a person at Home Depot and she suggested a fungicide spray or using calcium carbonate. The former is for isolated spots though and for the latter, I'd have to test the pH of the lawn and I'd run the risk of harming my lawn. From what I'm reading so far, mushrooms grow in an ideal environment and it's a sign of a healthy lawn. It just looks unsightly.
After reading several links like this one
How do I kill mushrooms that are growing in MY lawn
I've decide that I am just going to mow the lawn more frequently or rake them