No. Laser refractive surgery would only correct your vision just as glasses or contact lenses would, It would not improve visual acuity in an amblyopic eye. As you are already 20 and lazy eye has fully developed, there is no way to cure it.
No. Laser surgery have limited success for correcting a lazy eye. Laser eye surgery can correct your vision to the state that you can currently achieve in your glasses or contact lenses. Since glasses or contact lenses can't correct a lazy eye to normal vision, laser surgery can't cure lazy eye effectively.