Islamic Interpretation of Dreams (Ibn-i Sirin):
A locksmith in a dream represents a broker.
Ifhe locks the door of his own house in the dream, it means that he arranges marriages, or works as a wedding consultant.
If he locks the door of his shop in a dream, it means that he brokers merchandises and businesses.
Seeing a locksmith in a dream also means concealing a secrets, or it could mean marriage.