'Defeated' get's to be a tricky term. Lasers only do tiny amounts of kinetic damage, and most ground based structures carry enough mass - unlike planes or missiles - that they can absorb the heat pretty easily. Usually regarding lasers they are talking about taking out electronic systems, which screws a jet or missile, but doesn't do much to tanks, howitzers, or APCs. Those Roving Foxholes can absorb just about anything short of a nuclear strike, and even then it needs to be a farirly close hit.

In this case we are definetly not talking about either a meter wide hole in the door or a smoking crater, and most tanks would surive an attack that produced what you and I would think of as a smoking crater anyway. Just to give you an idea, to burn through an inch of steel a meter wide would require energies on an order of a gigajoule which need to be delivered in well under a second, required a multi-gigawatt generator, not counting that few lasers run at anything like 100% efficiency. You want to leave a smoking crater on par with what a large artillery round or cruise missile would cause you looking at needing a laser hooked up to a nuclear reactor, and a big one at that.