I doubt I would ever get into a 'regular' 9-5 style job or work outside the home to have to worry about this, but...
Well, my workplace is my home. Does that count?
That is similar for me - since December 2009, I have returned to live in my father's
home and take care of him. He is Christian, not Buddhist - so to prevent any upset I placed my Buddhist altar behind the bedside cabinet - that way, I was free to have my own sacred space and he would not see it to become offended.
It is easier still since December 2010, as he now stays on the ground floor only in the converted lounge due to his mobility problems, so i am free to rearrange my room in any way, and could now have my Buddha statue in any position should i choose to change things around. My son has now moved in too on this level, but he is fully aware of my Buddhist practices and although not a Buddhist himself, is not offended by it as he does not practice any specific religion.He is used to my 'little Buddhist corner' from when I lived in Australia with him previous to rushing on over here to look after Dad.