Where there's a will, there's a way. Look at some of the creative ways Germans attempted to cross over into West Berlin. Whether it was a hot-air balloon, swimming across the Baltic Sea, or hiding under pig carcasses in a refrigerated truck, people made it across. And the Berlin Wall was no joke either.
That actually excludes the landmines and ignores the fact that prior to 1983, SM-70 antipersonnel directional mines were used and they were extremely effective. Here are the escape attempt stats from 1974 to 1979 as compiled by the East German government
At its peak, the Berlin Wall was the most heavily guarded area in the world, even more so than the 38th parallel. But that didn't stop people from trying to cross it and neither will any wall Trump authorizes.