There is a way to get unlimited golden keys on ps4 : r/borderlands3
Borderlands 3 SHiFT Codes for Golden Keys (May 2022) » MentalMars
Borderlands on Twitter: "Use these SHiFT codes to unlock 5 Golden Keys in Borderlands: The Pre-Sequel! [Active through 01/29] PC / Mac / Linux: WCKTB-HSWJF-BKT33-T3JTB-33RRC XBOne/XB360: WCKTB-HSWRB-FRX36-W6JTB-33RSB PS4/PS3: WCKTB-HSWJH-HST53-Z3KTB ...