How can I open up my the cover to switch the corroded batteries?

I had received a Minolta XG-M for Christmas which hasn't been used by my family since the late 80's/ early 90' and as i tried to open up the lid for the batteries i noticed that i couldn't open it. For the last month I've been trying to open it up using coins and screwdrivers but neither of them are working. I assume the batteries are most likely corroded but does anybody have any ideas on what i can do to get it open?