As an unmarried female is there a prohibition of Yichud for me at work? I work with 2 other frum men in a locked room (from the outside) and there are 2 other male key holders who come in very occasionally. Other people come sometimes but have to ring the bell in order to be let in.

Shalom U'vracha There is a problem of yichud at work and one needs to be extra careful as in the work setting it is common to develop close relationships with fellow workers. If you are in the company of two respectable men and two other people have unrestricted access then it is permitted to work in such a setting, but again you need to be careful about too much friendly contact with your male co-workers. Kol Tuv Gideon Weitzman