The answer to this question will depend on your workplace. If you work for a Christian company where there is an atmosphere of prayer and ministry in place, it will be much easier to minister to your colleagues, although sensitivity will always be required.
If not, it may be more difficult to speak to your fellow workers or clients without finding yourself in hot water. You may also have been put off by news stories you’ve heard about street evangelists who have faced opposition, people being pulled up about wearing crosses at work and the Christian bakery that was penalised for refusing to produce a cake promoting gay marriage. It’s important to be aware of the risks, but there are still ways for you to make an impact in your place of work.
It may seem impossible to live as a Christian at your place of work, let alone minister to colleague, but remember that everyone needs to hear the gospel and you may be their only chance of hearing it. Be sensitive but ready to share at all times.