How to free the captured character in the Act 1 mission.
Freeing Brick in Cyberpunk 2077is a possible optional objective in Act 1 missionThe Pickup.
This page explains how to complete both objectives before you complete The Pickup.
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When you approach the door, the find a way to free Brick objective will appear.
This will come up with a number of options.
Select Remote Deactivation, and the door will swiftly open itself to you.
There are a few ways to do this.
Otherwise, you could find the detonator.
Leave the room, and enter the door immediately to the left.
On the side is the detonator.
Pick it up, then disarm the charge.
(you might also opt to blow it up - the choice, ultimately, is yours.)