Ugh that's the worst timing! Honestly, skip the basic latch and just get a hasp and staple with a padlock. The whole point is that wind can't jiggle it open if it's actually locked. A latch by itself can still bounce up in a serious gust. I learned this the hard way when my shed door blew open and ruined a lawnmower.

My cousin in Tucson had a slab lift two inches after a monsoon season. The contractor blamed a failed barrier seam. I get why someone would want that extra seal now.

Forget the little stakes, did you actually screw the anchors into the floor frame like you said? I tried that once but the plastic frame cracked when I drilled into it. Ended up having to build a whole wooden base just to have something solid to attach to. Seems like the floor is the weakest part of the whole setup.