It depends upon which side of the door you're on. The floor switch should be placed back of the radius of the door swing.

For decades the doors at many stores opened when you stepped on a black-rubber mat. Seems to me like this idea is essentially same. I think the electric-eye used on many doors now is so much better, what with no platform to install and no contacts to fail. But electric eyes are used for doors that open for everybody. If you had a platform or an eye for the handicap doors, they would open more cycles and wear out more quickly.

There are already doors that open automatically by a sensor over the door . But I like the idea if it was a little on the slow-side to be considerate, then healthy-people would likely not want to use the handicapped-persons door and thus be out of the way of handicapped-people .