As I was briefly a beneficiary of SNAP EBT ("Food Stamps") I was subjected to the process of managing that debit card. When checking out, for example from Walmart.com, a popup would appear so that the user can input his PIN.
The popup was served by the SNAP EBT provider, and it would randomize the PIN number pad. So indeed, you couldn't rely on muscle memory to input your PIN because the number pad changed every time input was requested. It seemed that the mouse was also required for this input, rather than the keyboard.