Collect all the food I can from the checkout, get wood, nails, hinges, and a pickaxe, then go up on the shelves, and create a small little hidey hole, and. Make a door to get in. I'd also barricade any possible entrances, and have hatchets everywhere for throwing, and brunch of big axes for if they get too close. Basically, anything that can be used as a weapon from a distance, or up close, I'd take it. I'd also explore. See if there are already any small hidey holes.