"emergency doors shall not be so locked or fastened that they cannot be easily and immediately opened by any person who may require to use them in an emergency"
So speaketh the Fire Precautions (Workplace) Regulations.
Of course it may be that the shop floor area and risks are such that only one exit is required, in which case the security locks are ok, but the door should not have any Fire Exit signage.
(the number, distribution and dimensions of emergency routes and exits shall be adequate having regard to the use, equipment and dimensions of the workplace and the maximum number of persons that may be present there at any one time)
An assessment would need to take into account floor area, exit width, travel distances, protection of routes, active & passive precautions, nature of combustibles and ignition sources, etc.