HOW DO I AJUST THE SIZE OF MY PATIO DOORS?

I HAD THREE BI-FOLD PATIO DOORS FITTED AND INSTALLED (FOR SECURITY PURPOSES). THEN THE FLOORS WERE SCREEDED READY FOR THE TILES AND THE TILES WERE LAID, UNTIL IT BECAME APPARENT THAT THE DOORS WOULD NO LONGER OPEN. (THEY OPEN INWARDS) THESE DOORS WHERE CRAFTSMEN MADE BECAUSE OF THE ODD SIZE. I WOULD LIKE TO AJUST THESE DOORS TO FIT BUT FEAR WEAKENING THEM AS THEY ARE GLAZED AND THERE IS NOT A LOT OF MATERIAL TO WORK WITH. CAN YOU SUGGEST ANYTHING?