How to set a timeout while using Lock_Order in OE_ORDER_PUB

I am using OE_ORDER_PUB in my custom program to update the sales order and below is my flow.

1. Call Get_Order

2. If success then pass values to Lock_Order

3. If success then call Process_Order to update the sales order

But the issue comes when an order is locked by an front end user, the lock_order procedure in the custom program keeps on waiting indefinitely.
I could not find any useful information regarding this Oracle Support.

Any advise is much appreciated.

Thanks,
Viswanathan