1. Impersonal or passive construction indicating work is done, people work, or one works in general
One works hard in this company.
Trabalha-se muito nesta empresa.
2. Third person singular present indicative of 'trabalhar' with the reflexive pronoun 'se' used as an impersonal construction
It is said that people work better in the morning.
Diz-se que trabalha-se melhor de manhã.