Please solve the programming task below using a self-contained code snippet in a markdown code block.

A transaction is possibly invalid if:

the amount exceeds $1000, or;
if it occurs within (and including) 60 minutes of another transaction with the same name in a different city.

You are given an array of strings transaction where transactions[i] consists of comma-separated values representing the name, time (in minutes), amount, and city of the transaction.
Return a list of transactions that are possibly invalid. You may return the answer in any order.
 
Please complete the following python code precisely:
```python
class Solution:
    def invalidTransactions(self, transactions: List[str]) -> List[str]:
```