Assalamu Alaikum
When people are at work then why do they go to the toilet? Because they have to right? Sameway we HAVE to pray Salaah no matter where we are there are no excuses to miss it at all. No workplace or educational institution will ever stop you from praying but most of the time you never even have to tell them anything because it does not take long at all.
When people go to the toilet at work or at school then they usually take 5 minutes or longer. So instead of going to the toilet then you can go and pray which will take you even less time than a person who goes to the toilet. It is not difficult to pray at work at all but we make it difficult for ourselves. We can pray ANYWHERE apart from the toilet and where there is visible impurities.There is no excuse for praying Qadha after work because there is sufficient time and space at work in order to pray all of the Salaah. If there is no room allocated to prayer than there will always be a room empty. If there is no room empty then there is always a corridor, staircase or any place where there is sufficient space in order for one to make Sajda properly.
Let us be of those Muslims that when prayer time comes we strive to pray no matter where we are and what we are doing. So let us make the FULL effort for the pleasure of Allah and do not forget who gives us the jobs we have and the food we eat and the very life we lead. So let us pray to the one that is worthy of all worship.
Insha Allah Khayr