I`m with PKR, if you can get in the car, remove the rear seats, interior side panels and finally the parcel shelf and fish the keys out with a stick/magnet/chewing gum/etc.
I've done the above, removing the interior panels etc, horrible job with a good chance of damaging/cracking the side panels.
If you can't
open the boot I'd rather cut a rectangular section, 3 sides, out of the boot middle floor/rear side, with an angle grinder, probably up a bit at the rear, bend it out then push the rear upright carpet in & your hand should be above the bottom of the curved 'floor' carpeted area where hopefully the keys will be?
It may depend on where the car is currently parked though?
Afterwards a good welder can reseal it & it won't be seen anyway.
I'd still try an Auto Locksmith 1st.
The OP hasn't replied for 23 hrs, probably sorted it already without telling us.