Ensure the key is not already turned to the "locked" position, which can sometimes bind the mechanism.
Electronic versions use a keypad and often have a factory default code for first-time use. Как открыть сейф Safeguard SD-103 T
The manual emphasizes: When anti-mask is ON, if someone sprays paint or places tape over the lens, the sensor immediately sends a tamper alarm. Do not enable this if you clean the sensor weekly.