If you hold Pakistani nationality, you are generally expected to enter and exit Pakistan using your Pakistani passport.
Citizenship status
Dual nationals are typically treated as Pakistani citizens while in the country. Immigration authorities may require entry on a Pakistani passport rather than a foreign one.
Expired documents
If your Pakistani passport is expired, renewal before travel helps avoid complications at entry or departure.
Travel documentation
Carrying both passports when traveling can assist with onward international journeys, but entry rules are based on citizenship status.