In the unfortunate event you forget your keys and lock yourself out, simply inform the accommodation team at reception. You will be asked to complete the lock out log and confirm your identity, before a member of staff will walk you to your room and let you in. If you are locked out after the reception has shut - no need to panic - there is 24 hour security, just contact a member of the team by telephoning 0114 275 4659 and explain that you have been locked out.
If you have permanently lost your keys, you will need to purchase a new set. For more information on the cost of this please come to reception.