The TSBD front entrance door swings both ways so it was probably swung inwards if a lot of people were going in along with Baker.
There might be an issue with the front desk area by Truly office as a bottleneck because it required a part of the counter top to be swung open but I’m not certain if it was locked or not. Probably was not, as Truly would be fumbling for a key.
None the less, it was closed when Truly got there and he had to open it so he and Baker could go thru. It’s in Truly WC testimony somewhere about them getting delayed at this countertop area by Trulys office.
This might explain the gap of time between Lovelady/Shelley seeing Adams and Styles going past the elevators while Truly/Baker did not.