Miss Spell

- No hay Salida
- Se Prohibe la Salida
- Salida Prohibida

- either of this would have worked better

Prohiba exists but as conjugation of the verb to forbid: prohibir

example:

- "El que prohíba la salida" (note the accent on the i)
- "He who forbids the exit"

Found this one in a parking lot of a hospital, who has actual translators and interpreters and their nurses go through bilingual training...