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This video shows you how to install locking type laminate under a door jam. Don't try to do the last row and slide it under the jam. You need to place two rows into the space and cut the locking lip off the tongue of the second row from jam. Don't remove the tongue, just the locking nib that runs along it. Place some glue on tongue. Press down while sliding into place. Remember you must have enough space so you can slide it all the way to the wall and then tap laminate towards you to lock in to place as shown. The previous owner left the large gap under the door I did not. You shouldn't either.