Hopefully....
John combo52 or someone else knowledgeable will be able to help you to figure out the latch adjustment, if one is possible; sometimes latches wear and are of a design where they can't be adjusted.
You said you have "A Corelle smooth-top oven." Just to let you know, the cooktop on your range is Pyroceram, the glass-ceramic material classic Corning Ware was made of. Corelle is made of a laminated glass called Vitrelle, a different substance altogether. Vitrelle could not possibly be used for a smooth-top; it cannot take the direct heat involved.