Which would put them in roughly equal capacity as that STR 22 Barbarian door-kicking wise. A SEAL is usually rated at level 10 in d20Modern, which is officially 3 levels less in comparative ability than D&D, in many ways, but for the sake of rough equivalency, lets ignore that fact. At best, your Marine is going to be STR 21 or so, and the average Marine is likely to be STR 17-20. If a weaker person could do it with a high likelihood of success (typical is 2-3 tries to bust a door via kicking it) then the stronger, possibly Raging, Barbarian should be able to bust it more easily. Not necessarily terribly much so, but the d20 check should still be a success more than 20% of the time. 40% or so seems far more reasonable. Since this Barb also probably has Rage or magical items boosting his effective Str score (22 seems a bit too low for a level 10 Barb, after ability boosting magics and items) he should be capable of doing this even more reliably. I'd say we're hitting the magical 50% chance zone or thereabouts for rough equivalency in likelihood.
This IS all assuming the doors are equivalently thick and made of the same material.