Taking a lead in panel data

I have checked that. It allows me to get the t-1, t-2 value but not the t+1
value.
Is there any other way of achieving this other than using the plm package?

It would be easier to help if you provided a minimal reproducible
example, as requested in the posting guide. Have you tried
diff(x, lag = -1, ...)

or
lag(x, k = -1, ...)

Perhaps this does what you want. Regards
Liviu