if its right in the door way you may be able to take up less flooring than if it were in the middle of the room. i would use either a plunge cut saw. or a circular saw with an old blade set to the depth of the flooring thickness. cut a few peices of the laminate next to the doorway and pull them up, weaving back a couple peices so you can peice new ones in provided you have extra. from there simply pick up a transition strip to hide the gape between the flooring in the doorway.
otherwise you will have to remove the baseboard and take up full the flooring throughtout the entire room
fire up the saw and make some dust