I'm not sure if this is relevant to you, but many employers have to comply with governmental policies and regulations that are meant to promote ride-sharing and other alternative transit options, including bicycling.

Maybe this is something you could learn more about, and see if it applies to your company. It could be an incentive for your employer to actually work with you to make it possible to safely store your bike, as you're helping them meet .gov requirements by riding your bike.