How is it not possible for the laws of thermal dynamics to never go beyond a closed system

If the laws of thermal dynamics only work on a closed system how is that possible? It happens everywhere all the time. Even our sun and countless others all are in a state of entropy. Everything must pass from one form to another so how is that a closed system? The food I eat had energy taken from a chemical reaction. The chemicals are now in my body. I am using these chemicals as energy to type or speak. This is energy that is being used and transferred. My voice produces sound sound is energy. Energy can neither be created nor destroyed only transformed from one form to another but never back to it's original form. Even water falls under this category. In order for water to be produced energy is needed. If it was a closed system then perpetual energy would be possible cause in a closed system where is the energy coming from. It can not feed off itself. That would be perpetual.

The universe as a whole is a Closed System. We are assuming that energy neither enters or leaves the universe. The universe is behaving like an Ideal Gas expanding into an infinate volume. Energy used on earth is radiated as infrared to the universe and contributes to the expansion. At the Big Bang the universe was compact and very hot this implies that at the Big Bang the entropy of the universe=0. The matter and energy present at the Big Bang is expanding and the universe is cooling adiabatic ===> the energy is being more and more diffuse ===> entropy is increasing for the universe as a whole.

On a smaller scale the Laws of Thermodynamics can only be applied to closed systems because it must be possible to account for all the energy and that implies a control volume

the theory is built by assuming the system is closed, no energy on particles transferred to/from surroundings of the system. in practice, yes we can't close it perfectly but we can get it more than close enough for many systems.