Would it be possible to totally close the border to for example Germany, France, or Czechia, like NZ can do? I highly doubt it but am open to ideas. It would ce

Would it be possible to totally close the border to for example Germany, France, or Czechia, like NZ can do? I highly doubt it but am open to ideas. It would certainly be immoral to use force to hinder native citizens from travelling out of the country.